[cros] Allow media streaming for OOBE WebUI.


BUG=122764
TEST=Manual with --enable-html5-camera


Review URL: https://chromiumcodereview.appspot.com/10693027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@144899 0039d316-1c4b-4281-b951-d872f2087c98
  virtual ~SnifferObserver() {}

  virtual ~SnifferObserver() {}
