Remove NOTIFICATION_EXTENSION_ENABLED.

extensions/browser/extension_registry.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_BROWSER_EXTENSION_REGISTRY_H_
 #define EXTENSIONS_BROWSER_EXTENSION_REGISTRY_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 77 matching lines @@
 
   // Invokes the observer method OnExtensionLoaded(). The extension must be
   // enabled at the time of the call.
   void TriggerOnLoaded(const Extension* extension);
 
   // Invokes the observer method OnExtensionReady(). This always follows
   // an OnLoaded event, but is not called until it's safe to create the
   // extension's child process.
   void TriggerOnReady(const Extension* extension);
 
+  // Invokes the observer method OnExtensionEnabled().
+  void TriggerOnEnabled(const Extension* extension);
+
   // Invokes the observer method OnExtensionUnloaded(). The extension must not
   // be enabled at the time of the call.
   void TriggerOnUnloaded(const Extension* extension,
                          UnloadedExtensionReason reason);
 
   // If this is a fresh install then |is_update| is false and there must not be
   // any installed extension with |extension|'s ID. If this is an update then
   // |is_update| is true and must be an installed extension with |extension|'s
   // ID, and |old_name| must be non-empty.
   void TriggerOnWillBeInstalled(const Extension* extension,
@@ skipping 88 matching lines @@
   base::ObserverList<ExtensionRegistryObserver> observers_;
 
   content::BrowserContext* const browser_context_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionRegistry);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_REGISTRY_H_