Update the PushEvent to have a nullable PushMessageData

chrome/browser/push_messaging/push_messaging_service_impl.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_PUSH_MESSAGING_PUSH_MESSAGING_SERVICE_IMPL_H_
 #define CHROME_BROWSER_PUSH_MESSAGING_PUSH_MESSAGING_SERVICE_IMPL_H_
 
 #include <stdint.h>
 #include <set>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/background/background_trigger.h"
 #include "components/content_settings/core/browser/content_settings_observer.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/gcm_driver/common/gcm_messages.h"
 #include "components/gcm_driver/gcm_app_handler.h"
 #include "components/gcm_driver/gcm_client.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/push_messaging_service.h"
 #include "content/public/common/permission_status.mojom.h"
+#include "content/public/common/push_event_payload.h"
 #include "content/public/common/push_messaging_status.h"
 #include "third_party/WebKit/public/platform/modules/push_messaging/WebPushPermissionStatus.h"
 
 #if defined(ENABLE_NOTIFICATIONS)
 #include "chrome/browser/push_messaging/push_messaging_notification_manager.h"
 #endif
 
 class Profile;
 class PushMessagingAppIdentifier;
 class PushMessagingServiceObserver;
@@ skipping 169 matching lines @@
   gcm::GCMDriver* GetGCMDriver() const;
 
   // Testing methods -----------------------------------------------------------
 
   // Callback to be invoked when a message has been dispatched. Enables tests to
   // observe message delivery before it's dispatched to the Service Worker.
   using MessageDispatchedCallback =
       base::Callback<void(const std::string& app_id,
                           const GURL& origin,
                           int64_t service_worker_registration_id,
-                          const std::string& message_data)>;
+                          const content::PushEventPayload& payload)>;
 
   void SetMessageDispatchedCallbackForTesting(
       const MessageDispatchedCallback& callback) {
     message_dispatched_callback_for_testing_ = callback;
   }
 
   Profile* profile_;
 
   int push_subscription_count_;
   int pending_push_subscription_count_;
@@ skipping 12 matching lines @@
   MessageDispatchedCallback message_dispatched_callback_for_testing_;
 
   scoped_ptr<PushMessagingServiceObserver> push_messaging_service_observer_;
 
   base::WeakPtrFactory<PushMessagingServiceImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PushMessagingServiceImpl);
 };
 
 #endif  // CHROME_BROWSER_PUSH_MESSAGING_PUSH_MESSAGING_SERVICE_IMPL_H_