tracing: Make ConvertableToTraceFormat move-only scoped_ptr

cc/scheduler/scheduler.cc

Index: cc/scheduler/scheduler.cc
diff --git a/cc/scheduler/scheduler.cc b/cc/scheduler/scheduler.cc
index 61607de636c5fe9ddea388e3cd881f2031c65036..0af7fa6fb3b4efcc05a3ddddfd66eda09dd524c8 100644
--- a/cc/scheduler/scheduler.cc
+++ b/cc/scheduler/scheduler.cc
@@ -780,12 +780,12 @@ void Scheduler::ProcessScheduledActions() {
   SetupNextBeginFrameIfNeeded();
 }
 
-scoped_refptr<base::trace_event::ConvertableToTraceFormat> Scheduler::AsValue()
+scoped_ptr<base::trace_event::ConvertableToTraceFormat> Scheduler::AsValue()
     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());
   AsValueInto(state.get());
-  return state;
+  return std::move(state);
 }
 
 void Scheduler::AsValueInto(base::trace_event::TracedValue* state) const {