Revert of Disable NavigatorTestWithBrowserSideNavigation.BeginNavigation...

Revert of Disable NavigatorTestWithBrowserSideNavigation.BeginNavigation (patchset #1 id:1 of https://codereview.chromium.org/905463004/)

Reason for revert:
Test fixed in https://codereview.chromium.org/904673004/, https://crrev.com/315063.

Original issue's description:
> Disable NavigatorTestWithBrowserSideNavigation.BeginNavigation
>
> This test fails within the WebContentsObserverSanityChecker, since no IPC
> for RenderFrameCreated is sent. Disable while we find a good way to make
> the sanity checker play nicely within the unit test framework running in
> --site-per-process
>
> BUG=417518
>
> Committed: https://crrev.com/33e0ed259a19bc6c918fa11fcacffdf709440447
> Cr-Commit-Position: refs/heads/master@{#314960}

TBR=alexmos@chromium.org,jam@chromium.org,nasko@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=417518

Review URL: https://codereview.chromium.org/870653006

Cr-Commit-Position: refs/heads/master@{#315065}

testing/buildbot/chromium.fyi.json

@@ -335,7 +335,7 @@
   },
   "Site Isolation Linux": {
     "gtest_tests": [
-      { "test": "content_unittests", "args": ["--site-per-process", "--gtest_filter=-NavigatorTestWithBrowserSideNavigation.BeginNavigation"] },
+      { "test": "content_unittests", "args": ["--site-per-process"] },
       { "test": "content_browsertests", "args": ["--site-per-process", "--gtest_filter=-*.AllowTargetedNavigationsAfterSwap:*.SupportCrossProcessPostMessage:*.DisownOpener:*.DontPreemptNavigationWithFrameTreeUpdate:*.ProcessExitWithSwappedOutViews:*.SupportCrossProcessPostMessageWithMessagePort"] },
       { "test": "unit_tests", "args": ["--site-per-process"] },
       { "test": "browser_tests", "args": ["--site-per-process", "--gtest_filter=-AppApiTest.*:AutofillDialogControllerTest.*:BlockedAppApiTest.*:BookmarkOverrideTest.*:BrowserTest.OtherRedirectsDontForkProcess:ChromeAppAPITest.*:ChromeRenderProcessHostTest.*:ChromeRenderProcessHostTestWithCommandLine.*:DevToolsExperimentalExtensionTest.*:DevToolsExtensionTest.*:DnsProbeBrowserTest.*:ErrorPageTest.*:ExecuteScriptApiTest.ExecuteScriptPermissions:ExtensionApiTest.ContentScriptExtensionIframe:ExtensionApiTest.ContentScriptOtherExtensions:ExtensionApiTest.ContentScriptExtensionProcess:ExtensionApiTest.TabsOnUpdated:ExtensionApiTest.WindowOpenPopupIframe:ExtensionBrowserTest.LoadChromeExtensionsWithOptionsParamWhenEmbedded:ExtensionCrxInstallerTest.InstallDelayedUntilNextUpdate:ExtensionOptionsApiTest.ExtensionCanEmbedOwnOptions:ExtensionSettingsApiTest.SimpleTest:ExtensionWebUITest.CanEmbedExtensionOptions:ExtensionWebUITest.ReceivesExtensionOptionsOnClose:ExternallyConnectableMessagingTest.*:GeolocationBrowserTest.*:HistoryBrowserTest.*:InlineLoginUISafeIframeBrowserTest.*:IsolatedAppTest.*:LaunchWebAuthFlowFunctionTest.*:MimeHandlerViewTest.*:NaClBrowserTestNonSfiMode.*:OptionsUIBrowserTest.*:PhishingClassifierTest.*:PhishingDOMFeatureExtractorTest.*:PlatformAppUrlRedirectorBrowserTest.*:PopupBlockerBrowserTest.*:PortForwardingTest.*:PrerenderBrowserTest.*:ProcessManagementTest.*:ProfileManagerBrowserTest.*:RedirectTest.*:ReferrerPolicyTest.*:SandboxStatusUITest.*:SSLUITest.*:SyncFileSystemApiTest.GetFileStatuses:SyncFileSystemTest.*:WebNavigationApiTest.CrossProcessFragment:WebNavigationApiTest.ServerRedirectSingleProcess:WebNavigationApiTest.CrossProcessHistory:WebViewDPITest.*:WebViewPluginTest.*:WebViewTest.*:ZoomControllerBrowserTest.*"] }