tracing: Make ConvertableToTraceFormat move-only scoped_ptr

cc/debug/frame_timing_tracker_unittest.cc

 // 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.
 
 #include <stdint.h>
 
 #include <set>
 #include <string>
 
 #include "base/time/time.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "base/values.h"
 #include "cc/debug/frame_timing_tracker.h"
 #include "cc/test/fake_impl_task_runner_provider.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 #include "cc/test/test_shared_bitmap_manager.h"
 #include "cc/test/test_task_graph_runner.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
 std::string CompositeToString(
     scoped_ptr<FrameTimingTracker::CompositeTimingSet> timingset) {
-  scoped_refptr<base::trace_event::TracedValue> value =
-      new base::trace_event::TracedValue();
+  scoped_ptr<base::trace_event::TracedValue> value(
+      new base::trace_event::TracedValue());
   value->BeginArray("values");
   std::set<int> rect_ids;
   for (const auto& pair : *timingset)
     rect_ids.insert(pair.first);
 
   for (const auto& rect_id : rect_ids) {
     auto& events = (*timingset)[rect_id];
     value->BeginDictionary();
     value->SetInteger("rect_id", rect_id);
     value->BeginArray("events");
     for (const auto& event : events) {
       value->BeginDictionary();
       value->SetInteger("frame_id", event.frame_id);
       value->SetInteger("timestamp", event.timestamp.ToInternalValue());
       value->EndDictionary();
     }
     value->EndArray();
     value->EndDictionary();
   }
   value->EndArray();
   return value->ToString();
 }
 
 std::string MainFrameToString(
     scoped_ptr<FrameTimingTracker::MainFrameTimingSet> timingset) {
-  scoped_refptr<base::trace_event::TracedValue> value =
-      new base::trace_event::TracedValue();
+  scoped_ptr<base::trace_event::TracedValue> value(
+      new base::trace_event::TracedValue());
   value->BeginArray("values");
   std::set<int> rect_ids;
   for (const auto& pair : *timingset)
     rect_ids.insert(pair.first);
 
   for (const auto& rect_id : rect_ids) {
     auto& events = (*timingset)[rect_id];
     value->BeginDictionary();
     value->SetInteger("rect_id", rect_id);
     value->BeginArray("events");
@@ skipping 224 matching lines @@
       "{\"end_time\":110,\"frame_id\":3,\"timestamp\":100},"
       "{\"end_time\":220,\"frame_id\":1,\"timestamp\":200}],\"rect_id\":3},"
       "{\"events\":["
       "{\"end_time\":110,\"frame_id\":3,\"timestamp\":100}],\"rect_id\":4}"
       "]}",
       MainFrameToString(tracker->GroupMainFrameCountsByRectId()));
 }
 
 }  // namespace
 }  // namespace cc