The following safe browsing browser_tests hit NOTIMPLEMENTED():

NoStatePrefetchBrowserTest.PrerenderSafeBrowsingSubresource (../../chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc:559)
PrerenderBrowserTest.PrerenderSafeBrowsingClientRedirect (../../chrome/browser/prerender/prerender_browsertest.cc:2373)
PrerenderBrowserTest.PrerenderSafeBrowsingIframe (../../chrome/browser/prerender/prerender_browsertest.cc:2399)
PrerenderBrowserTest.PrerenderSafeBrowsingServerRedirect (../../chrome/browser/prerender/prerender_browsertest.cc:2363)
PrerenderBrowserTest.PrerenderSafeBrowsingSubresource (../../chrome/browser/prerender/prerender_browsertest.cc:2382)
PrerenderBrowserTest.PrerenderSafeBrowsingTopLevel (../../chrome/browser/prerender/prerender_browsertest.cc:2353)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeDontProceed/0 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeDontProceed/1 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeDontProceed/2 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeDontProceed/3 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeDontProceed/4 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeDontProceed/5 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeOptInAndReportThreatDetails/0 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeOptInAndReportThreatDetails/1 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeOptInAndReportThreatDetails/2 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeOptInAndReportThreatDetails/3 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeOptInAndReportThreatDetails/4 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeOptInAndReportThreatDetails/5 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeProceed/0 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeProceed/1 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeProceed/2 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeProceed/3 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeProceed/4 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.IframeProceed/5 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.MainFrameBlockedShouldHaveNoDOMDetailsWhenDontProceed/0 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.MainFrameBlockedShouldHaveNoDOMDetailsWhenDontProceed/1 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.MainFrameBlockedShouldHaveNoDOMDetailsWhenDontProceed/2 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.MainFrameBlockedShouldHaveNoDOMDetailsWhenDontProceed/3 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.MainFrameBlockedShouldHaveNoDOMDetailsWhenDontProceed/4 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.MainFrameBlockedShouldHaveNoDOMDetailsWhenDontProceed/5 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.MainFrameBlockedShouldHaveNoDOMDetailsWhenProceeding/0 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.MainFrameBlockedShouldHaveNoDOMDetailsWhenProceeding/1 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.MainFrameBlockedShouldHaveNoDOMDetailsWhenProceeding/2 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.MainFrameBlockedShouldHaveNoDOMDetailsWhenProceeding/3 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.MainFrameBlockedShouldHaveNoDOMDetailsWhenProceeding/4 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.MainFrameBlockedShouldHaveNoDOMDetailsWhenProceeding/5 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.SecurityStateDowngradedForSubresourceInterstitial/0 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.SecurityStateDowngradedForSubresourceInterstitial/1 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.SecurityStateDowngradedForSubresourceInterstitial/2 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.SecurityStateDowngradedForSubresourceInterstitial/3 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.SecurityStateDowngradedForSubresourceInterstitial/4 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.SecurityStateDowngradedForSubresourceInterstitial/5 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.SecurityStateGoBackOnSubresourceInterstitial/0 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.SecurityStateGoBackOnSubresourceInterstitial/1 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.SecurityStateGoBackOnSubresourceInterstitial/2 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.SecurityStateGoBackOnSubresourceInterstitial/3 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.SecurityStateGoBackOnSubresourceInterstitial/4 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.SecurityStateGoBackOnSubresourceInterstitial/5 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.WhitelistIframeRevisit/0 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.WhitelistIframeRevisit/1 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.WhitelistIframeRevisit/2 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.WhitelistIframeRevisit/3 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.WhitelistIframeRevisit/4 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)
SafeBrowsingBlockingPageBrowserTestWithThreatTypeAndIsolationSetting/SafeBrowsingBlockingPageBrowserTest.WhitelistIframeRevisit/5 (../../chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc:751)

This causes errors to be logged when they are run, which makes it confusing during refactoring whether you actually broke anything or not.

I produced this list by setting NOTIMPLEMENTED_POLICY to 3 in base/logging.h.

I haven't checked them exhaustively, but it appears that all the failures are in TestSafeBrowsingDatabaseManager::CheckResourceUrl(), so it should be easy to fix by adding a couple of overloads of this method.