tracing: Make ConvertableToTraceFormat move-only scoped_ptr

cc/debug/rendering_stats.cc

Index: cc/debug/rendering_stats.cc
diff --git a/cc/debug/rendering_stats.cc b/cc/debug/rendering_stats.cc
index b78b4f9f0b747c653ff2983b62eb4442b5b5dc5e..f0d56aab4adca567f9f717fd747db8764444b563 100644
--- a/cc/debug/rendering_stats.cc
+++ b/cc/debug/rendering_stats.cc
@@ -50,10 +50,10 @@ RenderingStats::RenderingStats(const RenderingStats& other) = default;
 RenderingStats::~RenderingStats() {
 }
 
-scoped_refptr<base::trace_event::ConvertableToTraceFormat>
+scoped_ptr<base::trace_event::ConvertableToTraceFormat>
 RenderingStats::AsTraceableData() const {
-  scoped_refptr<base::trace_event::TracedValue> record_data =
-      new base::trace_event::TracedValue();
+  scoped_ptr<base::trace_event::TracedValue> record_data(
+      new base::trace_event::TracedValue());
   record_data->SetInteger("frame_count", frame_count);
   record_data->SetInteger("visible_content_area", visible_content_area);
   record_data->SetInteger("approximated_visible_content_area",
@@ -80,7 +80,7 @@ RenderingStats::AsTraceableData() const {
 
   commit_to_activate_duration_estimate.AddToTracedValue(
       "commit_to_activate_duration_estimate_ms", record_data.get());
-  return record_data;
+  return std::move(record_data);
 }
 
 void RenderingStats::Add(const RenderingStats& other) {