Make WebSocket developers OWNERs of content/**/*websocket* files.

BUG=NONE
R=jam
NOTRY=true

Review URL: https://codereview.chromium.org/54493006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233252 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233252