Disables WebViewTest.InterstitialTeardown on windows as its flaky.

R=lazyboy@chromium.org
TBR=lazyboy@chromium.org
BUG=297014

Review URL: https://codereview.chromium.org/24103003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@224722 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 224722