rename PerformanceServerTiming members to conform with 'Blink Rename'

third_party/WebKit/Source/core/timing/PerformanceServerTiming.cpp

 // Copyright 2017 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 "core/timing/PerformanceServerTiming.h"
 
 #include "bindings/core/v8/V8ObjectBuilder.h"
 #include "core/timing/PerformanceBase.h"
 #include "platform/wtf/text/WTFString.h"
 
 namespace blink {
 
 PerformanceServerTiming::PerformanceServerTiming(const String& name,
                                                  const String& metric,
                                                  double duration,
                                                  const String& description)
     : PerformanceEntry(name, "server", 0.0, duration),
-      m_metric(metric),
-      m_description(description) {}
+      metric_(metric),
+      description_(description) {}
 
 PerformanceServerTiming::~PerformanceServerTiming() {}
 
 String PerformanceServerTiming::metric() const {
-  return m_metric;
+  return metric_;
 }
 
 String PerformanceServerTiming::description() const {
-  return m_description;
+  return description_;
 }
 
 void PerformanceServerTiming::BuildJSONValue(V8ObjectBuilder& builder) const {
   PerformanceEntry::BuildJSONValue(builder);
   builder.AddString("metric", metric());
   builder.AddString("description", description());
 }
 
 }  // namespace blink