tracing: Make ConvertableToTraceFormat move-only scoped_ptr

components/exo/surface.h

Index: components/exo/surface.h
diff --git a/components/exo/surface.h b/components/exo/surface.h
index ce6ba46256655da0ca279bc8d1551d86bf143b81..846d12be7754858e8b650ed275f7ee1b31835990 100644
--- a/components/exo/surface.h
+++ b/components/exo/surface.h
@@ -123,7 +123,7 @@ class Surface : public aura::Window,
   bool HasSurfaceObserver(const SurfaceObserver* observer) const;
 
   // Returns a trace value representing the state of the surface.
-  scoped_refptr<base::trace_event::TracedValue> AsTracedValue() const;
+  scoped_ptr<base::trace_event::TracedValue> AsTracedValue() const;
 
   bool HasPendingDamageForTesting(const gfx::Rect& damage) const {
     return pending_damage_.contains(gfx::RectToSkIRect(damage));