Replace use of system_wrappers/include/logging.h by base/logging.h.

webrtc/system_wrappers/include/metrics.h

 //
 // Copyright (c) 2014 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.
 //
 
 #ifndef WEBRTC_SYSTEM_WRAPPERS_INCLUDE_METRICS_H_
 #define WEBRTC_SYSTEM_WRAPPERS_INCLUDE_METRICS_H_
 
 #include <string>
 
 #include "webrtc/base/atomicops.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/common_types.h"
-#include "webrtc/system_wrappers/include/logging.h"
 
 // Macros for allowing WebRTC clients (e.g. Chrome) to gather and aggregate
 // statistics.
 //
 // Histogram for counters.
 // RTC_HISTOGRAM_COUNTS(name, sample, min, max, bucket_count);
 //
 // Histogram for enumerators.
 // The boundary should be above the max enumerator sample.
 // RTC_HISTOGRAM_ENUMERATION(name, sample, boundary);
@@ skipping 205 matching lines @@
 // Returns name of the histogram.
 const std::string& GetHistogramName(Histogram* histogram_pointer);
 
 // Function for adding a |sample| to a histogram.
 void HistogramAdd(Histogram* histogram_pointer, int sample);
 
 }  // namespace metrics
 }  // namespace webrtc
 
 #endif  // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_METRICS_H_