Revert 220369 "Add content::SurfaceCapturer".

Remove the unused SurfaceCapturer interface. Per discussion we will
not be using this for desktop capture.

BUG=NONE
TEST=local build, trybots
R=cdn@chromium.org, piman@chromium.org, sheu@chromium.org

Review URL: https://codereview.chromium.org/26313003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229229 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229229