tracing: Make ConvertableToTraceFormat move-only scoped_ptr

cc/layers/layer_impl.cc

Index: cc/layers/layer_impl.cc
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index aa34a8d3a715f9adaddfe1d26ed702515f60423a..21cdbe59395592de6be2dd8509a316ea133d2fb5 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -203,8 +203,8 @@ void LayerImpl::SetScrollParent(LayerImpl* parent) {
 }
 
 void LayerImpl::SetDebugInfo(
-    scoped_refptr<base::trace_event::ConvertableToTraceFormat> other) {
-  debug_info_ = other;
+    scoped_ptr<base::trace_event::ConvertableToTraceFormat> other) {
+  debug_info_ = std::move(other);
   SetNeedsPushProperties();
 }
 
@@ -609,7 +609,7 @@ void LayerImpl::PushPropertiesTo(LayerImpl* layer) {
   update_rect_.Union(layer->update_rect());
   layer->SetUpdateRect(update_rect_);
 
-  layer->SetDebugInfo(debug_info_);
+  layer->SetDebugInfo(std::move(debug_info_));
 
   if (frame_timing_requests_dirty_) {
     layer->SetFrameTimingRequests(frame_timing_requests_);