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

talk/media/base/fakemediaengine.h

Index: talk/media/base/fakemediaengine.h
diff --git a/talk/media/base/fakemediaengine.h b/talk/media/base/fakemediaengine.h
index 086f831dd0478db4fdd51d46c5764c6b23f82fe0..2c579e29375ed4d8e6c2fb91c37c1ec3bf517a98 100644
--- a/talk/media/base/fakemediaengine.h
+++ b/talk/media/base/fakemediaengine.h
@@ -438,7 +438,7 @@ class FakeVoiceMediaChannel : public RtpHelper<VoiceMediaChannel> {
                 int bits_per_sample,
                 int sample_rate,
                 int number_of_channels,
-                int number_of_frames) override {}
+                size_t number_of_frames) override {}
     void OnClose() override { renderer_ = NULL; }
     AudioRenderer* renderer() const { return renderer_; }