[App Banner] Use appropriate type parameters for WebCallbacks.

third_party/WebKit/Source/modules/app_banner/AppBannerCallbacks.h

 // Copyright 2015 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 AppBannerCallbacks_h
 #define AppBannerCallbacks_h
 
 #include "modules/app_banner/BeforeInstallPromptEvent.h"
 #include "public/platform/modules/app_banner/WebAppBannerClient.h"
 
 namespace blink {
 
 class AppBannerCallbacks : public WebAppBannerCallbacks {
     // FIXME(tasak): when making public/platform classes to use PartitionAlloc,
     // the following macro should be moved to WebCallbacks defined in public/platformWebCallbacks.h.
     USING_FAST_MALLOC(AppBannerCallbacks);
 public:
     explicit AppBannerCallbacks(UserChoiceProperty*);
     ~AppBannerCallbacks() override = default;
 
     // WebAppBannerCallbacks overrides.
-    void onSuccess(WebAppBannerPromptResult*) override;
+    void onSuccess(const WebAppBannerPromptResult&) override;
 
 private:
     Persistent<UserChoiceProperty> m_userChoice;
 };
 
 } // namespace blink
 
 #endif // AppBannerCallbacks_h