Move ExtensionHost into extensions namespace

chrome/browser/extensions/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_MESSAGE_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_MESSAGE_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/linked_ptr.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
-class ExtensionHost;
 class Profile;
 
 namespace content {
 class RenderProcessHost;
 class WebContents;
 }
 
 namespace extensions {
+class ExtensionHost;
 class LazyBackgroundTaskQueue;
 
 // This class manages message and event passing between renderer processes.
 // It maintains a list of processes that are listening to events and a set of
 // open channels.
 //
 // Messaging works this way:
 // - An extension-owned script context (like a background page or a content
 //   script) adds an event listener to the "onConnect" event.
 // - Another context calls "extension.connect()" to open a channel to the
@@ skipping 80 matching lines @@
   // Potentially registers a pending task with the LazyBackgroundTaskQueue
   // to open a channel. Returns true if a task was queued.
   bool MaybeAddPendingOpenChannelTask(Profile* profile,
                                       const OpenChannelParams& params);
 
   // Callbacks for LazyBackgroundTaskQueue tasks. The queue passes in an
   // ExtensionHost to its task callbacks, though some of our callbacks don't
   // use that argument.
   void PendingOpenChannel(const OpenChannelParams& params,
                           int source_process_id,
-                          ExtensionHost* host);
+                          extensions::ExtensionHost* host);
   void PendingCloseChannel(int port_id,
                            bool connection_error,
-                           ExtensionHost* host) {
+                           extensions::ExtensionHost* host) {
     if (host)
       CloseChannel(port_id, connection_error);
   }
   void PendingPostMessage(int port_id,
                           const std::string& message,
-                          ExtensionHost* host) {
+                          extensions::ExtensionHost* host) {
     if (host)
       PostMessageFromRenderer(port_id, message);
   }
 
   content::NotificationRegistrar registrar_;
   MessageChannelMap channels_;
   PendingChannelMap pending_channels_;
 
   // Weak pointer. Guaranteed to outlive this class.
   LazyBackgroundTaskQueue* lazy_background_task_queue_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageService);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_MESSAGE_SERVICE_H_