Add ExtensionSytem::Get(Profile*) as a wrapper around

chrome/browser/extensions/extension_system.h

 // Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_EXTENSION_SYSTEM_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SYSTEM_H_
 #pragma once
 
 #include <string>
 
@@ skipping 19 matching lines @@
 // The ExtensionSystem manages the creation and destruction of services
 // related to extensions. Most objects are shared between normal
 // and incognito Profiles, except as called out in comments.
 // This interface supports using TestExtensionSystem for TestingProfiles
 // that don't want all of the extensions baggage in their tests.
 class ExtensionSystem : public ProfileKeyedService {
  public:
   ExtensionSystem();
   virtual ~ExtensionSystem();
 
+  // Returns the instance for the given profile, or NULL if none. This is
+  // a convenience wrapper around ExtensionSystemFactory::GetForProfile.
+  static ExtensionSystem* Get(Profile* profile);

[Yoyo Zhou, 2012/04/04 22:54:21]

I think GetForProfile is still preferable.

[Matt Perry, 2012/04/04 22:56:44]

Blech. Unnecessarily verbose IMO. No one is going to be confused seeing
ExtensionSytem::Get(profile)

+
   // ProfileKeyedService implementation.
   virtual void Shutdown() OVERRIDE {}
 
   // Initializes extensions machinery.
   // Component extensions are always enabled, external and user extensions
   // are controlled by |extensions_enabled|.
   virtual void Init(bool extensions_enabled) = 0;
 
   // The ExtensionService is created at startup.
   virtual ExtensionService* extension_service() = 0;
@@ skipping 115 matching lines @@
   // The services that have their own instances in incognito.
   scoped_refptr<ExtensionDevToolsManager> extension_devtools_manager_;
   // |extension_process_manager_| must be destroyed before the Profile's
   // |io_data_|. While |extension_process_manager_| still lives, we handle
   // incoming resource requests from extension processes and those require
   // access to the ResourceContext owned by |io_data_|.
   scoped_ptr<ExtensionProcessManager> extension_process_manager_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SYSTEM_H_