[oilpan] Make the oilpan branch build on Mac.

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 90 matching lines @@
     metaKey = static_cast<bool>(keyState & PlatformEvent::MetaKey);
 
     return PlatformMouseEvent(dragData->clientPosition(), dragData->globalPosition(),
                               LeftButton, PlatformEvent::MouseMoved, 0, shiftKey, ctrlKey, altKey,
                               metaKey, currentTime());
 }
 
 DragController::DragController(Page* page, DragClient* client)
     : m_page(page)
     , m_client(client)
-    , m_documentUnderMouse(0)
-    , m_dragInitiator(0)
-    , m_fileInputElementUnderMouse(0)
     , m_documentIsHandlingDrag(false)
     , m_dragDestinationAction(DragDestinationActionNone)
     , m_dragSourceAction(DragSourceActionNone)
     , m_didInitiateDrag(false)
     , m_sourceDragOperation(DragOperationNone)
 {
     ASSERT(m_client);
 }
 
 DragController::~DragController()
@@ skipping 827 matching lines @@
 #endif
     return maxDragImageSize;
 }
 
 void DragController::cleanupAfterSystemDrag()
 {
 }
 
 } // namespace WebCore