Revert 240470 "Make WebRTC browser tests fail cleaner when the h..."

> Make WebRTC browser tests fail cleaner when the host fails to provide a camera.
> 
> BUG=327673
> NOTRY=True
> 
> Review URL: https://codereview.chromium.org/114063003

TBR=phoglund@chromium.org

Review URL: https://codereview.chromium.org/98203007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240494 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240494