app_shell: Convert ExtensionsWebContentsObserver to BrowserContext from Profile

chrome/browser/extensions/api/messaging/message_service.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_API_MESSAGING_MESSAGE_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_API_MESSAGING_MESSAGE_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 10 matching lines @@
 #include "content/public/browser/notification_registrar.h"
 
 class GURL;
 class Profile;
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace content {
+class BrowserContext;
 class RenderProcessHost;
 class WebContents;
 }
 
 namespace extensions {
 class Extension;
 class ExtensionHost;
 class LazyBackgroundTaskQueue;
 
 // This class manages message and event passing between renderer processes.
@@ skipping 66 matching lines @@
   // Allocates a pair of port ids.
   // NOTE: this can be called from any thread.
   static void AllocatePortIdPair(int* port1, int* port2);
 
   explicit MessageService(Profile* profile);
   virtual ~MessageService();
 
   // ProfileKeyedAPI implementation.
   static ProfileKeyedAPIFactory<MessageService>* GetFactoryInstance();
 
-  // Convenience method to get the MessageService for a profile.
-  static MessageService* Get(Profile* profile);
+  // Convenience method to get the MessageService for a browser context.
+  static MessageService* Get(content::BrowserContext* profile);
 
   // Given an extension's ID, opens a channel between the given renderer "port"
   // and every listening context owned by that extension. |channel_name| is
   // an optional identifier for use by extension developers.
   void OpenChannelToExtension(
       int source_process_id, int source_routing_id, int receiver_port_id,
       const std::string& source_extension_id,
       const std::string& target_extension_id,
       const GURL& source_url,
       const std::string& channel_name,
@@ skipping 137 matching lines @@
   LazyBackgroundTaskQueue* lazy_background_task_queue_;
 
   base::WeakPtrFactory<MessageService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageService);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_MESSAGING_MESSAGE_SERVICE_H_