Disable three cast_unittests on OS_WIN

TBR=mikhal@chromium.org
BUG=329563

Review URL: https://codereview.chromium.org/109743003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241607 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241607