Oilpan: Replace RefPtrs to Node and its subclasses in core/html with Oilpan transitin types.

Source/core/html/shadow/SliderThumbElement.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 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.
@@ skipping 230 matching lines @@
     return hostInput() && hostInput()->matchesReadWritePseudoClass();
 }
 
 Node* SliderThumbElement::focusDelegate()
 {
     return hostInput();
 }
 
 void SliderThumbElement::dragFrom(const LayoutPoint& point)
 {
-    RefPtr<SliderThumbElement> protector(this);
+    RefPtrWillBeRawPtr<SliderThumbElement> protector(this);
     startDragging();
     setPositionFromPoint(point);
 }
 
 void SliderThumbElement::setPositionFromPoint(const LayoutPoint& point)
 {
     RefPtrWillBeRawPtr<HTMLInputElement> input(hostInput());
     Element* trackElement = input->userAgentShadowRoot()->getElementById(ShadowElementNames::sliderTrack());
 
     if (!input->renderer() || !renderBox() || !trackElement->renderBox())
@@ skipping 208 matching lines @@
     case MediaVolumeSliderThumbPart:
     case MediaFullScreenVolumeSliderPart:
     case MediaFullScreenVolumeSliderThumbPart:
         return mediaSliderContainer;
     default:
         return sliderContainer;
     }
 }
 
 }