[PushMessaging] Use appopriate type parameters for WebCallbacks (3/3).

public/platform/modules/push_messaging/WebPushProvider.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 WebPushProvider_h
 #define WebPushProvider_h
 
 #include "public/platform/WebCallbacks.h"
 #include "public/platform/WebPassOwnPtr.h"
-#include "public/platform/modules/push_messaging/WebPushError.h"
 #include "public/platform/modules/push_messaging/WebPushPermissionStatus.h"
 #include "public/platform/modules/push_messaging/WebPushSubscription.h"
 
 namespace blink {
 
 class WebServiceWorkerRegistration;
+struct WebPushError;
 struct WebPushSubscriptionOptions;
 
-class WebPushSubscriptionCallbacks : public WebCallbacks<WebPassOwnPtr<WebPushSubscription>, const WebPushError&> {
-public:
-    void onSuccess(WebPushSubscription* r)
-    {
-        onSuccess(adoptWebPtr(r));
-    }
-    void onError(WebPushError* e)
-    {
-        onError(*e);
-        delete e;
-    }
-    void onSuccess(WebPassOwnPtr<WebPushSubscription>) override {}
-    void onError(const WebPushError&) override {}
-};
-class WebPushPermissionStatusCallbacks : public WebCallbacks<WebPushPermissionStatus, const WebPushError&> {
-public:
-    void onSuccess(WebPushPermissionStatus* r)
-    {
-        onSuccess(*r);
-    }
-    void onError(WebPushError* e)
-    {
-        onError(*e);
-        delete e;
-    }
-    void onSuccess(WebPushPermissionStatus) override {}
-    void onError(const WebPushError&) override {}
-};
+using WebPushSubscriptionCallbacks = WebCallbacks<WebPassOwnPtr<WebPushSubscription>, const WebPushError&>;
+using WebPushPermissionStatusCallbacks = WebCallbacks<WebPushPermissionStatus, const WebPushError&>;
 using WebPushUnsubscribeCallbacks = WebCallbacks<bool, const WebPushError&>;
 
 class WebPushProvider {
 public:
     virtual ~WebPushProvider() { }
 
     // Takes ownership of the WebPushSubscriptionCallbacks.
     // Does not take ownership of the WebServiceWorkerRegistration.
     virtual void subscribe(WebServiceWorkerRegistration*, const WebPushSubscriptionOptions&, WebPushSubscriptionCallbacks*) = 0;
 
     // Takes ownership of the WebPushSubscriptionCallbacks.
     // Does not take ownership of the WebServiceWorkerRegistration.
     virtual void getSubscription(WebServiceWorkerRegistration*, WebPushSubscriptionCallbacks*) = 0;
 
     // Takes ownership of the WebPushPermissionStatusCallbacks.
     // Does not take ownership of the WebServiceWorkerRegistration.
     virtual void getPermissionStatus(WebServiceWorkerRegistration*, const WebPushSubscriptionOptions&, WebPushPermissionStatusCallbacks*) = 0;
 
     // Takes ownership if the WebPushUnsubscribeCallbacks.
     // Does not take ownership of the WebServiceWorkerRegistration.
     virtual void unsubscribe(WebServiceWorkerRegistration*, WebPushUnsubscribeCallbacks*) = 0;
 };
 
 } // namespace blink
 
 #endif // WebPushProvider_h