GitLab

The extensions module should not be listening to Chrome notifications.
Move the observation to ChromeProcessManagerDelegate.

BUG=396083
TEST=browser_tests ProcessManager* and unit_tests ProcessManager*

Review URL: https://codereview.chromium.org/415933003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285482 0039d316-1c4b-4281-b951-d872f2087c98