Enable Desktop Capture API for all apps in Stable channel.

BUG=134249

Review URL: https://codereview.chromium.org/141073003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245620 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245620