tracing: Make ConvertableToTraceFormat move-only scoped_ptr

components/exo/buffer.h

Index: components/exo/buffer.h
diff --git a/components/exo/buffer.h b/components/exo/buffer.h
index a98c4b314f77b5d242e509780d74c2f134cb0dcf..84e744ea7e2d8a5922caec319f9e8f07c4d1ab89 100644
--- a/components/exo/buffer.h
+++ b/components/exo/buffer.h
@@ -63,7 +63,7 @@ class Buffer : public base::SupportsWeakPtr<Buffer> {
   gfx::Size GetSize() const;
 
   // Returns a trace value representing the state of the buffer.
-  scoped_refptr<base::trace_event::TracedValue> AsTracedValue() const;
+  scoped_ptr<base::trace_event::TracedValue> AsTracedValue() const;
 
  private:
   class Texture;