Fixed WebDragData's wrong dependency.

Source/web/WebPluginContainerImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2014 Opera Software ASA. 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 792 matching lines @@
         dragStatus = WebDragStatusLeave;
     else if (event->type() == EventTypeNames::dragover)
         dragStatus = WebDragStatusOver;
     else if (event->type() == EventTypeNames::drop)
         dragStatus = WebDragStatusDrop;
 
     if (dragStatus == WebDragStatusUnknown)
         return;
 
     DataTransfer* dataTransfer = event->dataTransfer();
-    WebDragData dragData(dataTransfer->dataObject());
+    WebDragData dragData = dataTransfer->dataObject()->toWebDragData();
     WebDragOperationsMask dragOperationMask = static_cast<WebDragOperationsMask>(dataTransfer->sourceOperation());
     WebPoint dragScreenLocation(event->screenX(), event->screenY());
     WebPoint dragLocation(event->absoluteLocation().x() - location().x(), event->absoluteLocation().y() - location().y());
 
     m_webPlugin->handleDragStatusUpdate(dragStatus, dragData, dragOperationMask, dragLocation, dragScreenLocation);
 }
 
 void WebPluginContainerImpl::handleWheelEvent(WheelEvent* event)
 {
     WebMouseWheelEventBuilder webEvent(this, m_element->renderer(), *event);
@@ skipping 157 matching lines @@
 
     return clipRect;
 }
 
 bool WebPluginContainerImpl::pluginShouldPersist() const
 {
     return m_webPlugin->shouldPersist();
 }
 
 } // namespace blink