Revert of Remove unnecessary uses of GarbageCollectedFinalized<>.

third_party/WebKit/Source/core/page/DragController.cpp

 /*
  * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 123 matching lines @@
     : m_page(page)
     , m_documentUnderMouse(nullptr)
     , m_dragInitiator(nullptr)
     , m_fileInputElementUnderMouse(nullptr)
     , m_documentIsHandlingDrag(false)
     , m_dragDestinationAction(DragDestinationActionNone)
     , m_didInitiateDrag(false)
 {
 }
 
+DragController::~DragController()
+{
+}
+
 DragController* DragController::create(Page* page)
 {
     return new DragController(page);
 }
 
 static DocumentFragment* documentFragmentFromDragData(DragData* dragData, LocalFrame* frame, Range* context, bool allowPlainText, bool& chosePlainText)
 {
     ASSERT(dragData);
     chosePlainText = false;
 
@@ skipping 838 matching lines @@
 
 DEFINE_TRACE(DragController)
 {
     visitor->trace(m_page);
     visitor->trace(m_documentUnderMouse);
     visitor->trace(m_dragInitiator);
     visitor->trace(m_fileInputElementUnderMouse);
 }
 
 } // namespace blink