Provide an overload to WebView::create that does not require a WebViewClient.

third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp

 /*
  * Copyright (C) 2013 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 274 matching lines @@
 }
 
 void WebEmbeddedWorkerImpl::prepareShadowPageForLoader() {
   // Create 'shadow page', which is never displayed and is used mainly to
   // provide a context for loading on the main thread.
   //
   // FIXME: This does mostly same as WebSharedWorkerImpl::initializeLoader.
   // This code, and probably most of the code in this class should be shared
   // with SharedWorker.
   DCHECK(!m_webView);
-  m_webView = WebView::create(nullptr, WebPageVisibilityStateVisible);
+  m_webView = WebView::create(WebPageVisibilityStateVisible);
   WebSettings* settings = m_webView->settings();
   // FIXME: http://crbug.com/363843. This needs to find a better way to
   // not create graphics layers.
   settings->setAcceleratedCompositingEnabled(false);
   // Currently we block all mixed-content requests from a ServiceWorker.
   // FIXME: When we support FetchEvent.default(), we should relax this
   // restriction.
   settings->setStrictMixedContentChecking(true);
   settings->setAllowRunningOfInsecureContent(false);
   settings->setDataSaverEnabled(m_workerStartData.dataSaverEnabled);
@@ skipping 173 matching lines @@
       *this, *document, *m_workerContextClient);
   m_loaderProxy = WorkerLoaderProxy::create(this);
   m_workerThread =
       ServiceWorkerThread::create(m_loaderProxy, *m_workerGlobalScopeProxy);
   m_workerThread->start(std::move(startupData), m_mainThreadTaskRunners.get());
   m_workerInspectorProxy->workerThreadCreated(document, m_workerThread.get(),
                                               scriptURL);
 }
 
 }  // namespace blink