tracing: Make ConvertableToTraceFormat move-only scoped_ptr

cc/layers/layer.cc

 // Copyright 2010 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 "cc/layers/layer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1732 matching lines @@
   DCHECK_EQ(layer_tree_host_->source_frame_number(),
             paint_properties_.source_frame_number) <<
       "SavePaintProperties must be called for any layer that is painted.";
   return false;
 }
 
 bool Layer::IsSuitableForGpuRasterization() const {
   return true;
 }
 
-scoped_refptr<base::trace_event::ConvertableToTraceFormat>
-Layer::TakeDebugInfo() {
+scoped_ptr<base::trace_event::ConvertableToTraceFormat> Layer::TakeDebugInfo() {
   if (client_)
     return client_->TakeDebugInfo(this);
   else
     return nullptr;
 }
 
 void Layer::SetHasRenderSurface(bool has_render_surface) {
   if (has_render_surface_ == has_render_surface)
     return;
   has_render_surface_ = has_render_surface;
@@ skipping 311 matching lines @@
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 gfx::Transform Layer::screen_space_transform() const {
   DCHECK_NE(transform_tree_index_, -1);
   return ScreenSpaceTransformFromPropertyTrees(
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 }  // namespace cc