Remove name parameter from HistogramAdd function.

webrtc/system_wrappers/include/metrics_default.h

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 37 matching lines @@
 
 // Returns the number of times the |sample| has been added to the histogram.
 int NumEvents(const std::string& name, int sample);
 
 // Returns the total number of added samples to the histogram.
 int NumSamples(const std::string& name);
 
 // Returns the minimum sample value (or -1 if the histogram has no samples).
 int MinSample(const std::string& name);
 
-// Function for adding a |sample| to a histogram without checkking the name.
-void HistogramAdd(Histogram* histogram_pointer, int sample);
-
 }  // namespace metrics
 }  // namespace webrtc
 
 #endif  // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_METRICS_DEFAULT_H_