Refactoring: toPluginView and toPluginDocument implemented but not used.

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 260 matching lines @@
     static long long next = 0;
     return ++next;
 }
 
 WebPluginContainerImpl* WebFrameImpl::pluginContainerFromFrame(Frame* frame)
 {
     if (!frame)
         return 0;
     if (!frame->document() || !frame->document()->isPluginDocument())
         return 0;
-    PluginDocument* pluginDocument = static_cast<PluginDocument*>(frame->document());
+    PluginDocument* pluginDocument = toPluginDocument(frame->document());

[tkent, 2013/09/10 21:54:51]

nit: We can remove a local variable |pluginDocument|.
    return
toPluginContainerImpl(oPluginDocument(frame->document())->pluginWidget());

     return toPluginContainerImpl(pluginDocument->pluginWidget());
 }
 
 WebPluginContainerImpl* WebFrameImpl::pluginContainerFromNode(WebCore::Frame* frame, const WebNode& node)
 {
     WebPluginContainerImpl* pluginContainer = pluginContainerFromFrame(frame);
     if (pluginContainer)
         return pluginContainer;
     return toPluginContainerImpl(node.pluginContainer());
 }
@@ skipping 2184 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