Avoid double Register in NotificationRegistrar. It works in Release build but causes DCHECK crash in Debug.
Avoid double Register in NotificationRegistrar.
It works in Release build but causes DCHECK crash in Debug.

BUG=http://crosbug.com/9210
TEST=Manual

Review URL: http://codereview.chromium.org/5110005

git-svn-id: http://src.chromium.org/svn/trunk/src@66754 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 4c3e32fdb13c4ff39e405252519f1665b5030ea5
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser