Pass implementation object to supplemental classes by reference

Source/web/FrameLoaderClientImpl.cpp

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple 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.
@@ skipping 100 matching lines @@
 FrameLoaderClientImpl::~FrameLoaderClientImpl()
 {
 }
 
 void FrameLoaderClientImpl::dispatchDidClearWindowObjectInWorld(DOMWrapperWorld* world)
 {
     if (m_webFrame->client()) {
         m_webFrame->client()->didClearWindowObject(m_webFrame, world->worldId());
         Document* document = m_webFrame->frame()->document();
         if (document) {
-            WheelController::from(document);
+            WheelController::from(*document);
             if (RuntimeEnabledFeatures::deviceMotionEnabled())
-                DeviceMotionController::from(document);
+                DeviceMotionController::from(*document);
             if (RuntimeEnabledFeatures::deviceOrientationEnabled())
-                DeviceOrientationController::from(document);
+                DeviceOrientationController::from(*document);
             if (RuntimeEnabledFeatures::screenOrientationEnabled())
-                ScreenOrientationController::from(document);
+                ScreenOrientationController::from(*document);
         }
     }
 }
 
 void FrameLoaderClientImpl::documentElementAvailable()
 {
     if (m_webFrame->client())
         m_webFrame->client()->didCreateDocumentElement(m_webFrame);
 }
 
@@ skipping 362 matching lines @@
 {
     // FIXME: why might the webview be null?  http://b/1234461
     WebViewImpl* webview = m_webFrame->viewImpl();
     if (webview && webview->client())
         webview->client()->didStopLoading();
 }
 
 void FrameLoaderClientImpl::loadURLExternally(const ResourceRequest& request, NavigationPolicy policy, const String& suggestedName)
 {
     if (m_webFrame->client()) {
-        DocumentFullscreen::webkitCancelFullScreen(m_webFrame->frame()->document());
+        ASSERT(m_webFrame->frame()->document());
+        DocumentFullscreen::webkitCancelFullScreen(*m_webFrame->frame()->document());
         WrappedResourceRequest webreq(request);
         m_webFrame->client()->loadURLExternally(
             m_webFrame, webreq, static_cast<WebNavigationPolicy>(policy), suggestedName);
     }
 }
 
 bool FrameLoaderClientImpl::navigateBackForward(int offset) const
 {
     WebViewImpl* webview = m_webFrame->viewImpl();
     if (!webview->client())
@@ skipping 274 matching lines @@
     return adoptPtr(m_webFrame->client()->createApplicationCacheHost(m_webFrame, client));
 }
 
 void FrameLoaderClientImpl::didStopAllLoaders()
 {
     if (m_webFrame->client())
         m_webFrame->client()->didAbortLoading(m_webFrame);
 }
 
 } // namespace blink