History WebUI: enabling polymer 2 tests for previously flaky tests

Bug: 875461
Change-Id: I9acdff2f8b1afd4075057add7b1799f7e6a11141
Reviewed-on: https://chromium-review.googlesource.com/1211102Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Esmael El-Moslimany <aee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589258}

testing/buildbot/filters/webui_polymer2_browser_tests.filter

@@ -27,7 +27,6 @@
 -CrSettingsSiteListTest.SiteList
 -CrSettingsSubpageTest.All
 -CrSettingsZoomLevelsTest.All
--MaterialHistoryListTest.All
 -MediaRouterElementsBrowserTest.MediaRouterContainerCastModeList
 -MediaRouterElementsBrowserTest.MediaRouterContainerFilterPart1
 -MediaRouterElementsBrowserTest.MediaRouterContainerFirstRunFlow
@@ -36,9 +35,6 @@
 -PasswordsAndFormsBrowserTest.uiTests
 -SettingsAdvancedPageBrowserTest.Load
 
-# Mac only failure. See crbug.com/874976
--MaterialHistoryItemTest.All
-
 # Mac only failure. See crbug.com/876990
 -CrSettingsPrivacyPageTest.All
 

testing/buildbot/filters/webui_polymer2_interactive_ui_tests.filter

@@ -12,7 +12,6 @@ CrSettingsAnimatedPagesTest.All
 CrSettingsFocusRowBehavior.FocusTest
 CrSettingsSyncPageTest.All
 MaterialBookmarksFocusTest.All
-MaterialHistoryFocusTest.All
 PrintPreviewDestinationDialogInteractiveTest.FocusSearchBox
 PrintPreviewPrintHeaderInteractiveTest.FocusPrintOnReady
 SettingsUIBrowserTest.All