Revert 247689 "Use webrtc::MouseCursorMonitor for cursor shapes"

> Use webrtc::MouseCursorMonitor for cursor shapes
> 
> Use webrtc::MouseCursorMonitor for cursor shapes instead of
> webrtc::VideoFrameCapturer, in preparation for deprecating cursor shape
> functionality in the latter.
> 
> BUG=324033
> 
> Review URL: https://codereview.chromium.org/92473002

TBR=dcaiafa@chromium.org

Review URL: https://codereview.chromium.org/149563003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247691 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247691