GitLab

Currently when user signs out GCMInvalidationBridge stays registered
with GCMDriver preventing it from shutting down.
GCMInvalidationBridge needs to unregister when user signs out.

BUG=446349
R=jianli@chromium.org

Review URL: https://codereview.chromium.org/899353002

Cr-Commit-Position: refs/heads/master@{#315103}