Use unique_ptr for Create{ServiceWorkerNetworkProvider,ApplicationCacheHost}

third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextClient.h

Index: third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextClient.h
diff --git a/third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextClient.h b/third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextClient.h
index 90bc12be729205d5f103daca30d7ef883563577f..d63d48687962110345cda6b4d8f40534c17af1a3 100644
--- a/third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextClient.h
+++ b/third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextClient.h
@@ -240,10 +240,8 @@ class WebServiceWorkerContextClient {
 
   // Ownership of the returned object is transferred to the caller.

[nhiroki, 2017/05/01 05:04:28]

ditto.

   // This is called on the main thread.
-  virtual WebServiceWorkerNetworkProvider*
-  CreateServiceWorkerNetworkProvider() {
-    return nullptr;
-  }
+  virtual std::unique_ptr<WebServiceWorkerNetworkProvider>
+  CreateServiceWorkerNetworkProvider() = 0;
 
   // Creates a WebWorkerFetchContext for a service worker. Ownership of the
   // returned object is transferred to the caller. This is called on the main
@@ -255,9 +253,8 @@ class WebServiceWorkerContextClient {
 
   // Ownership of the returned object is transferred to the caller.

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

ditto.

   // This is called on the main thread.
-  virtual WebServiceWorkerProvider* CreateServiceWorkerProvider() {
-    return nullptr;
-  }
+  virtual std::unique_ptr<WebServiceWorkerProvider>
+  CreateServiceWorkerProvider() = 0;
 
   // Ownership of the passed callbacks is transferred to the callee, callee
   // should delete the callbacks after calling either onSuccess or onError.