tracing: Make ConvertableToTraceFormat move-only scoped_ptr

base/trace_event/trace_config.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_TRACE_EVENT_TRACE_CONFIG_H_
 #define BASE_TRACE_EVENT_TRACE_CONFIG_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 135 matching lines @@
 
   void SetTraceRecordMode(TraceRecordMode mode) { record_mode_ = mode; }
   void EnableSampling() { enable_sampling_ = true; }
   void EnableSystrace() { enable_systrace_ = true; }
   void EnableArgumentFilter() { enable_argument_filter_ = true; }
 
   // Writes the string representation of the TraceConfig. The string is JSON
   // 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;
 
   // Returns true if at least one category in the list is enabled by this
   // trace config.
   bool IsCategoryGroupEnabled(const char* category_group) const;
 
   // Merges config with the current TraceConfig
   void Merge(const TraceConfig& config);
@@ skipping 68 matching lines @@
   StringList included_categories_;
   StringList disabled_categories_;
   StringList excluded_categories_;
   StringList synthetic_delays_;
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_TRACE_CONFIG_H_