Remove chrome::NOTIFICATION_PROFILE_DESTROYED usage from src/extensions

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
diff --git a/chrome/browser/extensions/chrome_process_manager_delegate.h b/chrome/browser/extensions/chrome_process_manager_delegate.h
index 9bcc58a..e2f0fbe 100644
--- a/chrome/browser/extensions/chrome_process_manager_delegate.h
+++ b/chrome/browser/extensions/chrome_process_manager_delegate.h
@@ -39,6 +39,7 @@
   // Notification handlers.
   void OnBrowserWindowReady(Browser* browser);
   void OnProfileCreated(Profile* profile);
+  void OnProfileDestroyed(Profile* profile);
 
   content::NotificationRegistrar registrar_;