Convert JsonWriter::Write to taking a const ref for the in-param

ui/events/latency_info.cc

 // Copyright 2013 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/events/latency_info.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/json/json_writer.h"
@@ skipping 90 matching lines @@
 LatencyInfoTracedValue::FromValue(scoped_ptr<base::Value> value) {
   return scoped_refptr<base::trace_event::ConvertableToTraceFormat>(
       new LatencyInfoTracedValue(value.release()));
 }
 
 LatencyInfoTracedValue::~LatencyInfoTracedValue() {
 }
 
 void LatencyInfoTracedValue::AppendAsTraceFormat(std::string* out) const {
   std::string tmp;
-  base::JSONWriter::Write(value_.get(), &tmp);
+  base::JSONWriter::Write(*value_, &tmp);
   *out += tmp;
 }
 
 LatencyInfoTracedValue::LatencyInfoTracedValue(base::Value* value)
     : value_(value) {
 }
 
 // Converts latencyinfo into format that can be dumped into trace buffer.
 scoped_refptr<base::trace_event::ConvertableToTraceFormat> AsTraceableData(
     const ui::LatencyInfo& latency) {
@@ skipping 244 matching lines @@
       it++;
     }
   }
 }
 
 void LatencyInfo::Clear() {
   latency_components.clear();
 }
 
 }  // namespace ui