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

webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h

Index: webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h
diff --git a/webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h b/webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h
index 93261ab607dfc3204098460e18e0df252dc6ff7d..d26e2a19aa07796da582e96c3bbcfd8b191681ac 100644
--- a/webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h
+++ b/webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h
@@ -26,7 +26,7 @@ class MockAudioDecoder : public AudioDecoder {
       Decode,
       int(const uint8_t*, size_t, int, size_t, int16_t*, SpeechType*));
   MOCK_CONST_METHOD0(HasDecodePlc, bool());
-  MOCK_METHOD2(DecodePlc, int(int, int16_t*));
+  MOCK_METHOD2(DecodePlc, size_t(size_t, int16_t*));
   MOCK_METHOD0(Init, int());
   MOCK_METHOD5(IncomingPacket, int(const uint8_t*, size_t, uint16_t, uint32_t,
                                    uint32_t));