Update audio code to use size_t more correctly, webrtc/common_audio/ portion.

webrtc/common_audio/vad/vad_unittest.h

 /*
  *  Copyright (c) 2012 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 10 matching lines @@
 
 // Modes we support
 const int kModes[] = { 0, 1, 2, 3 };
 const size_t kModesSize = sizeof(kModes) / sizeof(*kModes);
 
 // Rates we support.
 const int kRates[] = { 8000, 12000, 16000, 24000, 32000, 48000 };
 const size_t kRatesSize = sizeof(kRates) / sizeof(*kRates);
 
 // Frame lengths we support.
-const int kMaxFrameLength = 1440;
-const int kFrameLengths[] = { 80, 120, 160, 240, 320, 480, 640, 960,
+const size_t kMaxFrameLength = 1440;
+const size_t kFrameLengths[] = { 80, 120, 160, 240, 320, 480, 640, 960,
     kMaxFrameLength };
 const size_t kFrameLengthsSize = sizeof(kFrameLengths) / sizeof(*kFrameLengths);
 
 }  // namespace
 
 class VadTest : public ::testing::Test {
  protected:
   VadTest();
   virtual void SetUp();
   virtual void TearDown();
 
   // Returns true if the rate and frame length combination is valid.
-  bool ValidRatesAndFrameLengths(int rate, int frame_length);
+  bool ValidRatesAndFrameLengths(int rate, size_t frame_length);
 };
 
 #endif  // WEBRTC_COMMON_AUDIO_VAD_VAD_UNITTEST_H