Oilpan: improve ScrollableArea handling.

Source/core/input/EventHandler.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011 Apple 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:
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 347 matching lines @@
     // TODO(rbyers): Mouse cursor update is page-wide, not per-frame.  Page-wide state
     // should move out of EventHandler to a new PageEventHandler class. crbug.com/449649
     Timer<EventHandler> m_cursorUpdateTimer;
 
     bool m_mouseDownMayStartAutoscroll;
 
     Timer<EventHandler> m_fakeMouseMoveEventTimer;
 
     bool m_svgPan;
 
-    DeprecatedPaintLayerScrollableArea* m_resizeScrollableArea;
+    RawPtrWillBeMember<DeprecatedPaintLayerScrollableArea> m_resizeScrollableArea;
 
     RefPtrWillBeMember<Node> m_capturingMouseEventsNode;
     bool m_eventHandlerWillResetCapturingMouseEventsNode;
 
     RefPtrWillBeMember<Node> m_nodeUnderMouse;
     RefPtrWillBeMember<Node> m_lastNodeUnderMouse;
     RefPtrWillBeMember<LocalFrame> m_lastMouseMoveEventSubframe;
     RefPtrWillBeMember<Scrollbar> m_lastScrollbarUnderMouse;
 
     int m_clickCount;
@@ skipping 59 matching lines @@
     // scroll which shouldn't propagate can't cause any element to
     // scroll other than the |m_previousGestureScrolledNode|.
     bool m_deltaConsumedForScrollSequence;
 };
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::EventHandler::TouchInfo);
 
 #endif // EventHandler_h