Extract GCMClient data types into separate gcm_types.h

chrome/browser/services/gcm/gcm_app_handler.h

 // Copyright 2014 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_SERVICES_GCM_GCM_APP_HANDLER_H_
 #define CHROME_BROWSER_SERVICES_GCM_GCM_APP_HANDLER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
-#include "google_apis/gcm/gcm_client.h"
 
 namespace gcm {
 
+struct IncomingMessage;
+struct SendErrorDetails;
+
 // Defines the interface to provide handling and event routing logic for a given
 // app.
 class GCMAppHandler {
  public:
   GCMAppHandler() {}
   virtual ~GCMAppHandler() {}
 
   // Called to do all the cleanup when GCM is shutting down.
   // In the case that multiple apps share the same app handler, it should be
   // make safe for ShutdownHandler to be called multiple times.
   virtual void ShutdownHandler() = 0;
 
   // Called when a GCM message has been received.
   virtual void OnMessage(const std::string& app_id,
-                         const GCMClient::IncomingMessage& message) = 0;
+                         const IncomingMessage& message) = 0;
 
   // Called when some GCM messages have been deleted from the server.
   virtual void OnMessagesDeleted(const std::string& app_id) = 0;
 
   // Called when a GCM message failed to be delivered.
-  virtual void OnSendError(
-      const std::string& app_id,
-      const GCMClient::SendErrorDetails& send_error_details) = 0;
+  virtual void OnSendError(const std::string& app_id,
+                           const SendErrorDetails& send_error_details) = 0;
 };
 
 }  // namespace gcm
 
 #endif  // CHROME_BROWSER_SERVICES_GCM_GCM_APP_HANDLER_H_