Prepare to convert various types to size_t.

webrtc/common_audio/resampler/sinusoidal_linear_chirp_source.h

 /*
  *  Copyright (c) 2013 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 22 matching lines @@
 
   void Run(int frames, float* destination) override;
 
   double Frequency(int position);
 
  private:
   enum {
     kMinFrequency = 5
   };
 
-  double sample_rate_;
+  int sample_rate_;
   int total_samples_;
   double max_frequency_;
   double k_;
   int current_index_;
   double delay_samples_;
 
   DISALLOW_COPY_AND_ASSIGN(SinusoidalLinearChirpSource);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_AUDIO_RESAMPLER_SINUSOIDAL_LINEAR_CHIRP_SOURCE_H_