Whitelist permission for Google Hotword Extension to access getUserMedia.

BUG=292856
R=miket@chromium.org, sergeyu@chromium.org

Review URL: https://codereview.chromium.org/24565003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226242 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226242
Cancel resources in the plugin process when a user presses the stop button or window.stop() is called.

BUG=286074
R=ananta@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=225099

Review URL: https://codereview.chromium.org/24302012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226243 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226243