tracing: Make ConvertableToTraceFormat move-only scoped_ptr

ui/events/latency_info.cc

Index: ui/events/latency_info.cc
diff --git a/ui/events/latency_info.cc b/ui/events/latency_info.cc
index 841d648ac848138f6f23596568bf7f5c7b41c4eb..12777ca3897731f7584a9f4f80d530d7e5c9be2a 100644
--- a/ui/events/latency_info.cc
+++ b/ui/events/latency_info.cc
@@ -84,7 +84,7 @@ bool IsInputLatencyBeginComponent(ui::LatencyComponentType type) {
 class LatencyInfoTracedValue
     : public base::trace_event::ConvertableToTraceFormat {
  public:
-  static scoped_refptr<ConvertableToTraceFormat> FromValue(
+  static scoped_ptr<ConvertableToTraceFormat> FromValue(
       scoped_ptr<base::Value> value);
 
   void AppendAsTraceFormat(std::string* out) const override;
@@ -98,9 +98,9 @@ class LatencyInfoTracedValue
   DISALLOW_COPY_AND_ASSIGN(LatencyInfoTracedValue);
 };
 
-scoped_refptr<base::trace_event::ConvertableToTraceFormat>
+scoped_ptr<base::trace_event::ConvertableToTraceFormat>
 LatencyInfoTracedValue::FromValue(scoped_ptr<base::Value> value) {
-  return scoped_refptr<base::trace_event::ConvertableToTraceFormat>(
+  return scoped_ptr<base::trace_event::ConvertableToTraceFormat>(
       new LatencyInfoTracedValue(value.release()));
 }
 
@@ -317,7 +317,7 @@ void LatencyInfo::AddLatencyNumberWithTimestampImpl(
   }
 }
 
-scoped_refptr<base::trace_event::ConvertableToTraceFormat>
+scoped_ptr<base::trace_event::ConvertableToTraceFormat>
 LatencyInfo::AsTraceableData() {
   scoped_ptr<base::DictionaryValue> record_data(new base::DictionaryValue());
   for (const auto& lc : latency_components_) {
@@ -337,7 +337,7 @@ LatencyInfo::AsTraceableData() {
   return LatencyInfoTracedValue::FromValue(std::move(record_data));
 }
 
-scoped_refptr<base::trace_event::ConvertableToTraceFormat>
+scoped_ptr<base::trace_event::ConvertableToTraceFormat>
 LatencyInfo::CoordinatesAsTraceableData() {
   scoped_ptr<base::ListValue> coordinates(new base::ListValue());
   for (size_t i = 0; i < input_coordinates_size_; i++) {