tracing: Make ConvertableToTraceFormat move-only scoped_ptr

cc/trees/layer_tree_host_impl.cc

 // 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 "cc/trees/layer_tree_host_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 3525 matching lines @@
 BeginFrameArgs LayerTreeHostImpl::CurrentBeginFrameArgs() const {
   // TODO(mithro): Replace call with current_begin_frame_tracker_.Current()
   // once all calls which happens outside impl frames are fixed.
   return current_begin_frame_tracker_.DangerousMethodCurrentOrLast();
 }
 
 base::TimeDelta LayerTreeHostImpl::CurrentBeginFrameInterval() const {
   return current_begin_frame_tracker_.Interval();
 }
 
-scoped_refptr<base::trace_event::ConvertableToTraceFormat>
+scoped_ptr<base::trace_event::ConvertableToTraceFormat>
 LayerTreeHostImpl::AsValueWithFrame(FrameData* frame) const {
-  scoped_refptr<base::trace_event::TracedValue> state =
-      new base::trace_event::TracedValue();
+  scoped_ptr<base::trace_event::TracedValue> state(
+      new base::trace_event::TracedValue());
   AsValueWithFrameInto(frame, state.get());
-  return state;
+  return std::move(state);
 }
 
 void LayerTreeHostImpl::AsValueWithFrameInto(
     FrameData* frame,
     base::trace_event::TracedValue* state) const {
   if (this->pending_tree_) {
     state->BeginDictionary("activation_state");
     ActivationStateAsValueInto(state);
     state->EndDictionary();
   }
@@ skipping 418 matching lines @@
   return task_runner_provider_->HasImplThread();
 }
 
 bool LayerTreeHostImpl::CommitToActiveTree() const {
   // In single threaded mode we skip the pending tree and commit directly to the
   // active tree.
   return !task_runner_provider_->HasImplThread();
 }
 
 }  // namespace cc