GitLab

The biggest improvement here is that early termination of the callback series is accomplished by deleting the object.

BUG=138583

Review URL: https://chromiumcodereview.appspot.com/10830146

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149951 0039d316-1c4b-4281-b951-d872f2087c98