[cc] Store CCLayerImpls as scoped_ptrs

cc/TiledLayerChromium.cpp

 // 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.
 
 #include "config.h"
 
 #if USE(ACCELERATED_COMPOSITING)
 
 #include "base/basictypes.h"
 #include "TiledLayerChromium.h"
@@ skipping 76 matching lines @@
     , m_sampledTexelFormat(LayerTextureUpdater::SampledTexelFormatInvalid)
     , m_tilingOption(AutoTile)
 {
     m_tiler = CCLayerTilingData::create(IntSize(), CCLayerTilingData::HasBorderTexels);
 }
 
 TiledLayerChromium::~TiledLayerChromium()
 {
 }
 
-PassOwnPtr<CCLayerImpl> TiledLayerChromium::createCCLayerImpl()
+scoped_ptr<CCLayerImpl> TiledLayerChromium::createCCLayerImpl()
 {
-    return CCTiledLayerImpl::create(id());
+    return CCTiledLayerImpl::create(id()).PassAs<CCLayerImpl>();
 }
 
 void TiledLayerChromium::updateTileSizeAndTilingOption()
 {
     ASSERT(layerTreeHost());
 
     const IntSize& defaultTileSize = layerTreeHost()->settings().defaultTileSize;
     const IntSize& maxUntiledLayerSize = layerTreeHost()->settings().maxUntiledLayerSize;
     int layerWidth = contentBounds().width();
     int layerHeight = contentBounds().height();
@@ skipping 701 matching lines @@
     prepaintRect.inflateX(m_tiler->tileSize().width());
     prepaintRect.inflateY(m_tiler->tileSize().height() * 2);
     IntRect contentRect(IntPoint::zero(), contentBounds());
     prepaintRect.intersect(contentRect);
 
     return prepaintRect;
 }
 
 }
 #endif // USE(ACCELERATED_COMPOSITING)