[cc] Store CCLayerImpls as scoped_ptrs

cc/TiledLayerChromium.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef TiledLayerChromium_h
 #define TiledLayerChromium_h
 
 #if USE(ACCELERATED_COMPOSITING)
 
 #include "CCLayerTilingData.h"
@@ skipping 54 matching lines @@
     // After preparing an update, returns true if more painting is needed.
     bool needsIdlePaint();
     IntRect idlePaintRect();
 
     bool skipsDraw() const { return m_skipsDraw; }
 
     // Virtual for testing
     virtual CCPrioritizedTextureManager* textureManager() const;
 
 private:
-    virtual PassOwnPtr<CCLayerImpl> createCCLayerImpl() OVERRIDE;
+    virtual scoped_ptr<CCLayerImpl> createCCLayerImpl() OVERRIDE;
 
     void createTilerIfNeeded();
     void setTilingOption(TilingOption);
 
     bool tileOnlyNeedsPartialUpdate(UpdatableTile*);
     bool tileNeedsBufferedUpdate(UpdatableTile*);
 
     void markOcclusionsAndRequestTextures(int left, int top, int right, int bottom, const CCOcclusionTracker*);
 
     bool updateTiles(int left, int top, int right, int bottom, CCTextureUpdateQueue&, const CCOcclusionTracker*, CCRenderingStats&, bool& didPaint);
@@ skipping 10 matching lines @@
     LayerTextureUpdater::SampledTexelFormat m_sampledTexelFormat;
 
     TilingOption m_tilingOption;
     OwnPtr<CCLayerTilingData> m_tiler;
 };
 
 }
 #endif // USE(ACCELERATED_COMPOSITING)
 
 #endif