Disable WebViewTest.Shim_TestWebRequestListenerSurvivesReparenting - it is flaky on WinXP

BUG=309451

Review URL: https://codereview.chromium.org/31023002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229697 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229697