Disable WebViewTest.TearDownTest on Windows. Flaky (times out).

BUG=303966
TBR=lazyboy@chromium.org

Review URL: https://codereview.chromium.org/25962002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226930 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226930