Cleanup: Adding more conversion helper interfaces.

Source/web/WebPluginContainerImpl.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 684 matching lines @@
     WebCursorInfo cursorInfo;
     if (m_webPlugin->handleInputEvent(webEvent, cursorInfo))
         event->setDefaultHandled();
 
     // A windowless plugin can change the cursor in response to a mouse move
     // event.  We need to reflect the changed cursor in the frame view as the
     // mouse is moved in the boundaries of the windowless plugin.
     Page* page = parentView->frame().page();
     if (!page)
         return;
-    ChromeClientImpl* chromeClient = static_cast<ChromeClientImpl*>(&page->chrome().client());
+    ChromeClientImpl* chromeClient = toChromeClientImpl(page->chrome().client());
     chromeClient->setCursorForPlugin(cursorInfo);
 }
 
 void WebPluginContainerImpl::handleDragEvent(MouseEvent* event)
 {
     ASSERT(event->isDragEvent());
 
     WebDragStatus dragStatus = WebDragStatusUnknown;
     if (event->type() == EventNames::dragenter)
         dragStatus = WebDragStatusEnter;
@@ skipping 175 matching lines @@
         // Take our element and get the clip rect from the enclosing layer and
         // frame view.
         clipRect.intersect(
             m_element->document().view()->windowClipRectForFrameOwner(m_element, true));
     }
 
     return clipRect;
 }
 
 } // namespace WebKit