Oilpan: fix build after r176651

Source/platform/graphics/GraphicsLayer.h

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. 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
@@ skipping 205 matching lines @@
     void setContentsToPlatformLayer(blink::WebLayer* layer) { setContentsTo(layer); }
     bool hasContentsLayer() const { return m_contentsLayer; }
 
     // Callback from the underlying graphics system to draw layer contents.
     void paintGraphicsLayerContents(GraphicsContext&, const IntRect& clip);
 
     // For hosting this GraphicsLayer in a native layer hierarchy.
     blink::WebLayer* platformLayer() const;
 
     typedef HashMap<int, int> RenderingContextMap;
-    PassRefPtrWillBeRawPtr<JSONObject> layerTreeAsJSON(LayerTreeFlags, RenderingContextMap&) const;
+    PassRefPtr<JSONObject> layerTreeAsJSON(LayerTreeFlags, RenderingContextMap&) const;
 
     int paintCount() const { return m_paintCount; }
 
     // Return a string with a human readable form of the layer tree, If debug is true
     // pointers for the layers and timing data will be included in the returned string.
     String layerTreeAsText(LayerTreeFlags = LayerTreeNormal) const;
     String debugName(blink::WebLayer*) const;
 
     void resetTrackedRepaints();
     void addRepaintRect(const FloatRect&);
@@ skipping 129 matching lines @@
 };
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void PLATFORM_EXPORT showGraphicsLayerTree(const WebCore::GraphicsLayer*);
 #endif
 
 #endif // GraphicsLayer_h