Skip test that requires multiple displays on win8

BUG=none
TBR=flackr@chromium.org

Review URL: https://codereview.chromium.org/32683008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230052 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230052