[cc] Store CCLayerImpls as scoped_ptrs

cc/CCLayerTreeHostImpl.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 CCLayerTreeHostImpl_h
 #define CCLayerTreeHostImpl_h
 
 #include "base/basictypes.h"
 #include "base/time.h"
 #include "CCAnimationEvents.h"
@@ skipping 156 matching lines @@
 
     bool initializeRenderer(scoped_ptr<CCGraphicsContext>);
     bool isContextLost();
     CCRenderer* renderer() { return m_renderer.get(); }
     const RendererCapabilities& rendererCapabilities() const;
 
     bool swapBuffers();
 
     void readback(void* pixels, const IntRect&);
 
-    void setRootLayer(PassOwnPtr<CCLayerImpl>);
+    void setRootLayer(scoped_ptr<CCLayerImpl>);
     CCLayerImpl* rootLayer() { return m_rootLayerImpl.get(); }
 
     void setHudLayer(CCHeadsUpDisplayLayerImpl* layerImpl) { m_hudLayerImpl = layerImpl; }
     CCHeadsUpDisplayLayerImpl* hudLayer() { return m_hudLayerImpl; }
 
     // Release ownership of the current layer tree and replace it with an empty
     // tree. Returns the root layer of the detached tree.
-    PassOwnPtr<CCLayerImpl> detachLayerTree();
+    scoped_ptr<CCLayerImpl> detachLayerTree();
 
     CCLayerImpl* rootScrollLayer() const { return m_rootScrollLayerImpl; }
 
     bool visible() const { return m_visible; }
     void setVisible(bool);
 
     int sourceFrameNumber() const { return m_sourceFrameNumber; }
     void setSourceFrameNumber(int frameNumber) { m_sourceFrameNumber = frameNumber; }
 
     bool contentsTexturesPurged() const { return m_contentsTexturesPurged; }
@@ skipping 104 matching lines @@
     bool ensureRenderSurfaceLayerList();
     void clearCurrentlyScrollingLayer();
 
     void animateScrollbarsRecursive(CCLayerImpl*, double monotonicTime);
 
     void dumpRenderSurfaces(std::string*, int indent, const CCLayerImpl*) const;
 
     scoped_ptr<CCGraphicsContext> m_context;
     OwnPtr<CCResourceProvider> m_resourceProvider;
     OwnPtr<CCRenderer> m_renderer;
-    OwnPtr<CCLayerImpl> m_rootLayerImpl;
+    scoped_ptr<CCLayerImpl> m_rootLayerImpl;
     CCLayerImpl* m_rootScrollLayerImpl;
     CCLayerImpl* m_currentlyScrollingLayerImpl;
     CCHeadsUpDisplayLayerImpl* m_hudLayerImpl;
     int m_scrollingLayerIdFromPreviousTree;
     bool m_scrollDeltaIsInScreenSpace;
     CCLayerTreeSettings m_settings;
     IntSize m_layoutViewportSize;
     IntSize m_deviceViewportSize;
     float m_deviceScaleFactor;
     bool m_visible;
@@ skipping 26 matching lines @@
 
     size_t m_numImplThreadScrolls;
     size_t m_numMainThreadScrolls;
 
     DISALLOW_COPY_AND_ASSIGN(CCLayerTreeHostImpl);
 };
 
 };
 
 #endif