Update a ton of audio code to use size_t more correctly and in general reduce

webrtc/modules/audio_coding/neteq/mock/mock_external_decoder_pcm16b.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 18 matching lines @@
  public:
   ExternalPcm16B() {}
   virtual int Init() { return 0; }
 
  protected:
   int DecodeInternal(const uint8_t* encoded,
                      size_t encoded_len,
                      int sample_rate_hz,
                      int16_t* decoded,
                      SpeechType* speech_type) override {
-    int16_t ret = WebRtcPcm16b_Decode(
-        encoded, static_cast<int16_t>(encoded_len), decoded);
+    size_t ret = WebRtcPcm16b_Decode(encoded, encoded_len, decoded);
     *speech_type = ConvertSpeechType(1);
-    return ret;
+    return static_cast<int>(ret);
   }
   size_t Channels() const override { return 1; }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ExternalPcm16B);
 };
 
 // Create a mock of ExternalPcm16B which delegates all calls to the real object.
 // The reason is that we can then track that the correct calls are being made.
 class MockExternalPcm16B : public ExternalPcm16B {
@@ skipping 19 matching lines @@
   MOCK_METHOD6(Decode,
                int(const uint8_t* encoded,
                    size_t encoded_len,
                    int sample_rate_hz,
                    size_t max_decoded_bytes,
                    int16_t* decoded,
                    SpeechType* speech_type));
   MOCK_CONST_METHOD0(HasDecodePlc,
       bool());
   MOCK_METHOD2(DecodePlc,
-      int(int num_frames, int16_t* decoded));
+      size_t(size_t num_frames, int16_t* decoded));
   MOCK_METHOD0(Init,
       int());
   MOCK_METHOD5(IncomingPacket,
       int(const uint8_t* payload, size_t payload_len,
           uint16_t rtp_sequence_number, uint32_t rtp_timestamp,
           uint32_t arrival_timestamp));
   MOCK_METHOD0(ErrorCode,
       int());
 
  private:
   ExternalPcm16B real_;
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ_MOCK_MOCK_EXTERNAL_DECODER_PCM16B_H_