Use unique_ptr for Create{ServiceWorkerNetworkProvider,ApplicationCacheHost}

third_party/WebKit/public/web/WebSharedWorkerClient.h

Index: third_party/WebKit/public/web/WebSharedWorkerClient.h
diff --git a/third_party/WebKit/public/web/WebSharedWorkerClient.h b/third_party/WebKit/public/web/WebSharedWorkerClient.h
index 93ac90f52e40bf3689566bbf2b9fda00e4566d34..a674292b9dfe592c6bf194d116d87ca4813b1aeb 100644
--- a/third_party/WebKit/public/web/WebSharedWorkerClient.h
+++ b/third_party/WebKit/public/web/WebSharedWorkerClient.h
@@ -67,7 +67,7 @@ class WebSharedWorkerClient {
 
   // 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.
@@ -80,11 +80,8 @@ class WebSharedWorkerClient {
   }
 
   // Called on the main thread during initialization.
-  // Ownership of the returned object is transferred to the caller.
-  virtual WebServiceWorkerNetworkProvider*
-  CreateServiceWorkerNetworkProvider() {
-    return nullptr;
-  }
+  virtual std::unique_ptr<WebServiceWorkerNetworkProvider>
+  CreateServiceWorkerNetworkProvider() = 0;
 
   virtual void SendDevToolsMessage(int session_id,
                                    int call_id,