Chrome Version: 5f9df04869c13d09182e36ad8f1c7192e0389214
OS: macOS 10.13 High Sierra

What steps will reproduce the problem?
(1) Run browser_tests on 10.13
(2) The following tests time out:

BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.PRE_TestSessionRestore/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.PRE_TestSessionRestore/1
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestAddTabDuringShutdown/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestAddTabDuringShutdown/1
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestAddTabWithBeforeUnloadDuringShutdown/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestAddTabWithBeforeUnloadDuringShutdown/1
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestAddWindowDuringShutdown/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestAddWindowDuringShutdown/1
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestAddWindowWithBeforeUnloadDuringShutdown/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestAddWindowWithBeforeUnloadDuringShutdown/1
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestBeforeUnloadMultipleSlowWindows/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestBeforeUnloadMultipleSlowWindows/1
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestCloseTabDuringShutdown/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestCloseTabDuringShutdown/1
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestCloseWindowDuringShutdown/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestCloseWindowDuringShutdown/1
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestHangInBeforeUnloadMultipleTabs/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestHangInBeforeUnloadMultipleTabs/1
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestHangInBeforeUnloadMultipleWindows/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestHangInBeforeUnloadMultipleWindows/1
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestMultipleWindows/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestMultipleWindows/1
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestOpenAndCloseWindowDuringShutdown/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestOpenAndCloseWindowDuringShutdown/1
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestShutdownMoreThanOnce/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestShutdownMoreThanOnce/1
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestSingleTabShutdown/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestSingleTabShutdown/1
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestUnloadMultipleSlowTabs/0
BrowserCloseManagerBrowserTest/BrowserCloseManagerBrowserTest.TestUnloadMultipleSlowTabs/1
BrowserCloseManagerWithBackgroundModeBrowserTest/BrowserCloseManagerWithBackgroundModeBrowserTest.CloseAllBrowsersWithBackgroundMode/0
BrowserCloseManagerWithBackgroundModeBrowserTest/BrowserCloseManagerWithBackgroundModeBrowserTest.CloseAllBrowsersWithBackgroundMode/1
BrowserCloseManagerWithDownloadsBrowserTest/BrowserCloseManagerWithDownloadsBrowserTest.TestWithDownloads/0
BrowserCloseManagerWithDownloadsBrowserTest/BrowserCloseManagerWithDownloadsBrowserTest.TestWithDownloads/1

What is the expected result?
Test passes

What happens instead?
Test times out

Please use labels and text to provide additional information.

Job: https://luci-milo.appspot.com/buildbot/chromium.fyi/Chromium%20Mac%2010.13/6
Logs: https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.fyi%2FChromium_Mac_10.13%2F6%2F%2B%2Frecipes%2Fsteps%2Fbrowser_tests%2F0%2Fstdout


For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.