tracing: Make ConvertableToTraceFormat move-only scoped_ptr

ui/compositor/layer_unittest.cc

 // Copyright (c) 2012 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 "ui/compositor/layer.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 677 matching lines @@
  private:
   scoped_ptr<NullLayerDelegate> default_layer_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerWithNullDelegateTest);
 };
 
 TEST_F(LayerWithNullDelegateTest, EscapedDebugNames) {
   scoped_ptr<Layer> layer(CreateLayer(LAYER_NOT_DRAWN));
   std::string name = "\"\'\\/\b\f\n\r\t\n";
   layer->set_name(name);
-  scoped_refptr<base::trace_event::ConvertableToTraceFormat> debug_info =
-    layer->TakeDebugInfo(layer->cc_layer_for_testing());
+  scoped_ptr<base::trace_event::ConvertableToTraceFormat> debug_info(
+      layer->TakeDebugInfo(layer->cc_layer_for_testing()));
   EXPECT_TRUE(debug_info.get());
   std::string json;
   debug_info->AppendAsTraceFormat(&json);
   base::JSONReader json_reader;
   scoped_ptr<base::Value> debug_info_value(json_reader.ReadToValue(json));
   EXPECT_TRUE(debug_info_value);
   EXPECT_TRUE(debug_info_value->IsType(base::Value::TYPE_DICTIONARY));
   base::DictionaryValue* dictionary = 0;
   EXPECT_TRUE(debug_info_value->GetAsDictionary(&dictionary));
   std::string roundtrip;
@@ skipping 1101 matching lines @@
   root->SetOpacity(0.5f);
   WaitForSwap();
   EXPECT_EQ(1u, animation_observer.animation_step_count());
 
   EXPECT_FALSE(animation_observer.shutdown());
   ResetCompositor();
   EXPECT_TRUE(animation_observer.shutdown());
 }
 
 }  // namespace ui