Handle disconnection events properly for unauthenticated clients.

Previously when receiving disconnection event the host was stopping
screen recorder even when there are other active sessions. Obviously
this is wrong.

BUG=128643

Review URL: https://chromiumcodereview.appspot.com/10409021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138185 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed