Disable AppRTC test on win until we can figure out symlink problem.

BUG=
TBR=xians@chromium.org

Review URL: https://codereview.chromium.org/40143004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230721 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230721