org.chromium.chrome.browser.metrics.MainIntentBehaviorMetricsIntegrationTest#testFocusOmnibox may be flaky.

Sample flake:
https://ci.chromium.org/p/chromium/builders/luci.chromium.try/android-marshmallow-arm64-rel/23873

DownloadActivity tests have been handled in other issues (see for example issue 855389).

Not sure how flaky this one is.