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As a result of replacing OSMesa with SwiftShader for running browser_tests
recently, 4 tests have become flaky on ChromeOS:
SiteDetailsBrowserTest.IsolateExtensions
ArcVoiceInteractionArcHomeServiceTest.VoiceInteractionStructureMultipleSelectionTest
ExtensionApiNewTabTest.Tabs
PasswordManagerBrowserTestWithViewsFeature.PromptForFetchSubmitWithoutNavigation

This cl temporarily disables these 4 tests on ChromeOs until we can find a
proper fix for them.

TBR=vasilii@chromium.org rdevlin.cronin@chromium.org hidehiko@chromium.org
TBR_REASON="Making the linux-chromeos-rel bot less flaky"

Bug: chromium:870372 chromium:870322 chromium:870319 chromium:671891
Change-Id: I55fdd44622f7fac13dafaa19699904178e37d1fb
Reviewed-on: https://chromium-review.googlesource.com/1161202
Commit-Queue: Alexis Hétu <sugoi@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580324}