Refactoring: Add toWebFrameImpl() interface.

Source/web/WebSharedWorkerImpl.cpp

 /*
  * 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 84 matching lines @@
     , m_askedToTerminate(false)
     , m_client(client)
     , m_pauseWorkerContextOnStart(false)
 {
     initializeWebKitStaticValues();
 }
 
 WebSharedWorkerImpl::~WebSharedWorkerImpl()
 {
     ASSERT(m_webView);
-    WebFrameImpl* webFrame = static_cast<WebFrameImpl*>(m_webView->mainFrame());
+    WebFrameImpl* webFrame = toWebFrameImpl(m_webView->mainFrame());
     if (webFrame)
         webFrame->setClient(0);
     m_webView->close();
 }
 
 void WebSharedWorkerImpl::stopWorkerThread()
 {
     if (m_askedToTerminate)
         return;
     m_askedToTerminate = true;
     if (m_workerThread)
         m_workerThread->stop();
 }
 
 void WebSharedWorkerImpl::initializeLoader(const WebURL& url)
 {
     // Create 'shadow page'. This page is never displayed, it is used to proxy the
     // loading requests from the worker context to the rest of WebKit and Chromium
     // infrastructure.
     ASSERT(!m_webView);
     m_webView = WebView::create(0);
     m_webView->settings()->setOfflineWebApplicationCacheEnabled(WebRuntimeFeatures::isApplicationCacheEnabled());
     // FIXME: Settings information should be passed to the Worker process from Browser process when the worker
     // is created (similar to RenderThread::OnCreateNewView).
     m_webView->initializeMainFrame(this);
 
-    WebFrameImpl* webFrame = static_cast<WebFrameImpl*>(m_webView->mainFrame());
+    WebFrameImpl* webFrame = toWebFrameImpl(m_webView->mainFrame());
 
     // Construct substitute data source for the 'shadow page'. We only need it
     // to have same origin as the worker so the loading checks work correctly.
     CString content("");
     int length = static_cast<int>(content.length());
     RefPtr<SharedBuffer> buffer(SharedBuffer::create(content.data(), length));
     webFrame->frame()->loader()->load(FrameLoadRequest(0, ResourceRequest(url), SubstituteData(buffer, "text/html", "UTF-8", KURL())));
 
     // This document will be used as 'loading context' for the worker.
     m_loadingDocument = webFrame->frame()->document();
@@ skipping 305 matching lines @@
     workerThread()->runLoop().postTaskForMode(createCallbackTask(dispatchOnInspectorBackendTask, String(message)), WorkerDebuggerAgent::debuggerTaskMode);
     WorkerDebuggerAgent::interruptAndDispatchInspectorCommands(workerThread());
 }
 
 WebSharedWorker* WebSharedWorker::create(WebSharedWorkerClient* client)
 {
     return new WebSharedWorkerImpl(client);
 }
 
 } // namespace WebKit