Use unique_ptr for Create{ServiceWorkerNetworkProvider,ApplicationCacheHost}

third_party/WebKit/public/web/WebSharedWorkerClient.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 49 matching lines @@
   virtual void WorkerScriptLoaded() = 0;
   virtual void WorkerScriptLoadFailed() = 0;
   virtual void SelectAppCacheID(long long) = 0;
 
   // Returns the notification presenter for this worker context. Pointer
   // is owned by the object implementing WebSharedWorkerClient.
   virtual WebNotificationPresenter* NotificationPresenter() = 0;
 
   // Called on the main webkit thread in the worker process during
   // initialization.
-  virtual WebApplicationCacheHost* CreateApplicationCacheHost(
+  virtual std::unique_ptr<WebApplicationCacheHost> CreateApplicationCacheHost(
       WebApplicationCacheHostClient*) = 0;
 
   // Called on the main thread during initialization.
   // WebWorkerContentSettingsClientProxy should not retain the given
   // WebSecurityOrigin, as the proxy instance is passed to worker thread
   // while WebSecurityOrigin is not thread safe.
   virtual WebWorkerContentSettingsClientProxy*
   CreateWorkerContentSettingsClientProxy(const WebSecurityOrigin& origin) {
     return nullptr;
   }
 
   // Called on the main thread during initialization.
   // Ownership of the returned object is transferred to the caller.

[nhiroki, 2017/05/01 05:04:27]

This ownership comment would be no longer useful.

-  virtual WebServiceWorkerNetworkProvider*
-  CreateServiceWorkerNetworkProvider() {
-    return nullptr;
-  }
+  virtual std::unique_ptr<WebServiceWorkerNetworkProvider>
+  CreateServiceWorkerNetworkProvider() = 0;
 
   virtual void SendDevToolsMessage(int session_id,
                                    int call_id,
                                    const WebString& message,
                                    const WebString& state) {}
   virtual WebDevToolsAgentClient::WebKitClientMessageLoop*
   CreateDevToolsMessageLoop() {
     return nullptr;
   }
 
   // Returns a new WebWorkerFetchContext for the shared worker. Ownership of the
   // returned object is transferred to the caller. This is used only when
   // off-main-thread-fetch is enabled.
   virtual std::unique_ptr<WebWorkerFetchContext> CreateWorkerFetchContext(
       WebServiceWorkerNetworkProvider*) {
     return nullptr;
   }
 };
 
 }  // namespace blink
 
 #endif