[cc] Store CCLayerImpls as scoped_ptrs

cc/CCScrollbarLayerImpl.h

 // Copyright 2012 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 CCScrollbarLayerImpl_h
 #define CCScrollbarLayerImpl_h
 
 #if USE(ACCELERATED_COMPOSITING)
 
 #include "CCLayerImpl.h"
 #include "CCScrollbarGeometryFixedThumb.h"
 #include <public/WebRect.h>
 #include <public/WebScrollbar.h>
 #include <public/WebVector.h>
 
 namespace cc {
 
 class ScrollView;
 
 class CCScrollbarLayerImpl : public CCLayerImpl {
 public:
-    static PassOwnPtr<CCScrollbarLayerImpl> create(int id);
+    static scoped_ptr<CCScrollbarLayerImpl> create(int id);
     virtual ~CCScrollbarLayerImpl();
 
     CCScrollbarGeometryFixedThumb* scrollbarGeometry() const { return m_geometry.get(); }
     void setScrollbarGeometry(PassOwnPtr<CCScrollbarGeometryFixedThumb>);
     void setScrollbarData(WebKit::WebScrollbar*);
 
     void setBackTrackResourceId(CCResourceProvider::ResourceId id) { m_backTrackResourceId = id; }
     void setForeTrackResourceId(CCResourceProvider::ResourceId id) { m_foreTrackResourceId = id; }
     void setThumbResourceId(CCResourceProvider::ResourceId id) { m_thumbResourceId = id; }
 
@@ skipping 70 matching lines @@
     bool m_isScrollViewScrollbar;
     bool m_enabled;
     bool m_isCustomScrollbar;
     bool m_isOverlayScrollbar;
 };
 
 }
 #endif // USE(ACCELERATED_COMPOSITING)
 
 #endif