Refactoring: Add convenience method toPluginContainerImpl.

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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 3147 matching lines @@
 {
     HitTestResult result = hitTestResultForWindowPos(location);
     RefPtr<Node> node = result.innerNonSharedNode();
     if (!node->hasTagName(HTMLNames::objectTag) && !node->hasTagName(HTMLNames::embedTag))
         return;
 
     RenderObject* object = node->renderer();
     if (object && object->isWidget()) {
         Widget* widget = toRenderWidget(object)->widget();
         if (widget && widget->isPluginContainer()) {
-            WebPluginContainerImpl* plugin = static_cast<WebPluginContainerImpl*>(widget);
+            WebPluginContainerImpl* plugin = toPluginContainerImpl(widget);
             switch (action.type) {
             case WebPluginAction::Rotate90Clockwise:
                 plugin->plugin()->rotateView(WebPlugin::RotationType90Clockwise);
                 break;
             case WebPluginAction::Rotate90Counterclockwise:
                 plugin->plugin()->rotateView(WebPlugin::RotationType90Counterclockwise);
                 break;
             default:
                 ASSERT_NOT_REACHED();
             }
@@ skipping 948 matching lines @@
 }
 
 bool WebViewImpl::shouldDisableDesktopWorkarounds()
 {
     ViewportArguments arguments = mainFrameImpl()->frame()->document()->viewportArguments();
     return arguments.width == ViewportArguments::ValueDeviceWidth || !arguments.userZoom
         || (arguments.minZoom == arguments.maxZoom && arguments.minZoom != ViewportArguments::ValueAuto);
 }
 
 } // namespace WebKit