[App Banner] Use appropriate type parameters for WebCallbacks.

components/test_runner/app_banner_client.cc

 // 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.
 
 #include "components/test_runner/app_banner_client.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "third_party/WebKit/public/platform/modules/app_banner/WebAppBannerPromptResult.h"
 
@@ skipping 10 matching lines @@
     blink::WebAppBannerCallbacks* callbacks) {
   callbacks_map_.AddWithID(callbacks, requestId);
 }
 
 void AppBannerClient::ResolvePromise(int request_id,
                                      const std::string& resolve_platform) {
   blink::WebAppBannerCallbacks* callbacks = callbacks_map_.Lookup(request_id);
   if (!callbacks)
     return;
 
-  scoped_ptr<blink::WebAppBannerPromptResult> result(
-      new blink::WebAppBannerPromptResult(
-          blink::WebString::fromUTF8(resolve_platform),
-          blink::WebAppBannerPromptResult::Outcome::Accepted));
-
   // If no platform has been set, treat it as dismissal.
-  if (resolve_platform.empty())
-    result->outcome = blink::WebAppBannerPromptResult::Outcome::Dismissed;
-
-  callbacks->onSuccess(result.release());
+  callbacks->onSuccess(blink::WebAppBannerPromptResult(
+      blink::WebString::fromUTF8(resolve_platform),
+      resolve_platform.empty()
+          ? blink::WebAppBannerPromptResult::Outcome::Dismissed
+          : blink::WebAppBannerPromptResult::Outcome::Accepted));
   callbacks_map_.Remove(request_id);
 }
 
 }  // namespace test_runner