Cleanup: Adding more conversion helper interfaces.

Source/web/WebFrameImpl.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 2237 matching lines @@
     frame()->view()->setInputEventsScaleFactorForEmulation(m_inputEventsScaleFactorForEmulation);
 
     if (isMainFrame)
         webView->suppressInvalidations(false);
 }
 
 WebFrameImpl* WebFrameImpl::fromFrame(Frame* frame)
 {
     if (!frame)
         return 0;
-    return static_cast<FrameLoaderClientImpl*>(frame->loader()->client())->webFrame();
+    return toFrameLoaderClientImpl(frame->loader()->client())->webFrame();
 }
 
 WebFrameImpl* WebFrameImpl::fromFrameOwnerElement(Element* element)
 {
     // FIXME: Why do we check specifically for <iframe> and <frame> here? Why can't we get the WebFrameImpl from an <object> element, for example.
     if (!element || !element->isFrameOwnerElement() || (!element->hasTagName(HTMLNames::iframeTag) && !element->hasTagName(HTMLNames::frameTag)))
         return 0;
     return fromFrame(toHTMLFrameOwnerElement(element)->contentFrame());
 }
 
@@ skipping 252 matching lines @@
 
         // There is a possibility that the frame being detached was the only
         // pending one. We need to make sure final replies can be sent.
         flushCurrentScopingEffort(m_findRequestIdentifier);
 
         cancelPendingScopingEffort();
     }
 }
 
 } // namespace WebKit