Pass implementation object to supplemental classes by reference

Source/web/ChromeClientImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * 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.
@@ skipping 205 matching lines @@
 Page* ChromeClientImpl::createWindow(Frame* frame, const FrameLoadRequest& r, const WindowFeatures& features,
     NavigationPolicy navigationPolicy, ShouldSendReferrer shouldSendReferrer)
 {
     if (!m_webView->client())
         return 0;
 
     WebNavigationPolicy policy = static_cast<WebNavigationPolicy>(navigationPolicy);
     if (policy == WebNavigationPolicyIgnore)
         policy = getNavigationPolicy();
 
-    DocumentFullscreen::webkitCancelFullScreen(frame->document());
+    ASSERT(frame->document());
+    DocumentFullscreen::webkitCancelFullScreen(*frame->document());
 
     WebViewImpl* newView = toWebViewImpl(
         m_webView->client()->createView(WebFrameImpl::fromFrame(frame), WrappedResourceRequest(r.resourceRequest()), features, r.frameName(), policy, shouldSendReferrer == NeverSendReferrer));
     if (!newView)
         return 0;
     return newView->page();
 }
 
 static inline void updatePolicyForEvent(const WebInputEvent* inputEvent, NavigationPolicy* policy)
 {
@@ skipping 721 matching lines @@
 {
     return static_cast<NavigatorContentUtilsClient::CustomHandlersState>(m_webView->client()->isProtocolHandlerRegistered(scheme, baseURL, url));
 }
 
 void NavigatorContentUtilsClientImpl::unregisterProtocolHandler(const String& scheme, const WebCore::KURL& baseURL, const WebCore::KURL& url)
 {
     m_webView->client()->unregisterProtocolHandler(scheme, baseURL, url);
 }
 
 } // namespace blink