chromeos: Disables a couple of tests for mus_browser_tests

These seem to be consistently failing on the bots.

BUG=none
TEST=none
R=jonross@chromium.org

Review-Url: https://codereview.chromium.org/2853733005
Cr-Commit-Position: refs/heads/master@{#468384}

testing/buildbot/filters/mus.browser_tests.filter

 BrowserTest.*
 # Failing test
 -BrowserTest.FullscreenBookmarkBar
+-BrowserTest.DisableOptionsAndImportMenuItemsConsistently
+-BrowserTest.ReattachDevToolsWindow
 
 # Flaky tests -crbug.com/707195
 -BrowserTest.AboutVersion
@@ -25,7 +27,6 @@ ChromeRenderViewTest.JSBlockSentAfterPageLoad
 ChromeRenderViewTest.PluginsTemporarilyAllowed
 ChromeServiceWorkerManifestFetchTest.OtherOrigin
 ChromeServiceWorkerManifestFetchTest.OtherOriginUseCredentials
-ChromeServiceWorkerManifestFetchTest.SameOrigin
 ChromeServiceWorkerManifestFetchTest.SameOriginUseCredentials
 ChromeServiceWorkerTest.CanCloseIncognitoWindowWithServiceWorkerController
 ChromeServiceWorkerTest.CanShutDownWithRegisteredServiceWorker
@@ -33,8 +34,6 @@ ChromeServiceWorkerTest.FailRegisterServiceWorkerWhenJSDisabled
 ChromeServiceWorkerTest.FallbackMainResourceRequestWhenJSDisabled
 ConstrainedWebDialogBrowserTest.ReleaseWebContents
 ContentVerifierPolicyTest.FailedUpdateRetries
-ContentVerifierPolicyTest.PRE_PolicyCorruptedOnStartup
-ContentVerifierPolicyTest.PolicyCorruptedOnStartup
 DeviceStatusCollectorNetworkInterfacesTest.NetworkInterfaces
 DeviceStatusCollectorNetworkInterfacesTest.ReportIfPublicSession
 DeviceStatusCollectorTest.ActivityCrossingMidnight