Revert 242361 "Add AshDesktopMediaList and enable Desktop Captur..."
new tests leak: http://build.chromium.org/p/chromium.memory.fyi/builders/Chromium%20OS%20%28valgrind%29%284%29/builds/23948

> Add AshDesktopMediaList and enable Desktop Capture API on Chrome OS.
> 
> The new AshDesktopMediaList gets list of windows/screens for the window
> picker dialog which allows to enable Desktop Capture API on Chrome OS.
> 
> BUG=295102
> R=ben@chromium.org, hshi@chromium.org
> 
> Review URL: https://codereview.chromium.org/100833002

TBR=sergeyu@chromium.org

Review URL: https://codereview.chromium.org/104583004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242366 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242366