system_wrappers: rename interface -> include

webrtc/system_wrappers/source/metrics_default.cc

 // 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.
 //
 
-#include "webrtc/system_wrappers/interface/metrics.h"
+#include "webrtc/system_wrappers/include/metrics.h"
 
 // Default implementation of histogram methods for WebRTC clients that do not
 // want to provide their own implementation.
 
 namespace webrtc {
 namespace metrics {
 
 Histogram* HistogramFactoryGetCounts(const std::string& name, int min, int max,
     int bucket_count) { return NULL; }
 
 Histogram* HistogramFactoryGetEnumeration(const std::string& name,
     int boundary) { return NULL; }
 
 void HistogramAdd(
     Histogram* histogram_pointer, const std::string& name, int sample) {}
 
 }  // namespace metrics
 }  // namespace webrtc