tracing: Make ConvertableToTraceFormat move-only scoped_ptr

base/trace_event/trace_config.h

Index: base/trace_event/trace_config.h
diff --git a/base/trace_event/trace_config.h b/base/trace_event/trace_config.h
index c7d3f4b379b7dcf36ae5c536e7a06155e80531e9..81b7d515133dd0c3c71f461316ced768e6fd9618 100644
--- a/base/trace_event/trace_config.h
+++ b/base/trace_event/trace_config.h
@@ -153,8 +153,8 @@ class BASE_EXPORT TraceConfig {
   // formatted.
   std::string ToString() const;
 
-  // Returns a scoped_refptr and wrap TraceConfig in ConvertableToTraceFormat
-  scoped_refptr<ConvertableToTraceFormat> AsConvertableToTraceFormat() const;
+  // Returns a copy of the TraceConfig wrapped in a ConvertableToTraceFormat
+  scoped_ptr<ConvertableToTraceFormat> AsConvertableToTraceFormat() const;
 
   // Write the string representation of the CategoryFilter part.
   std::string ToCategoryFilterString() const;