Enable cpplint and fix cpplint errors in webrtc/*audio

webrtc/common_audio/audio_converter.h

Index: webrtc/common_audio/audio_converter.h
diff --git a/webrtc/common_audio/audio_converter.h b/webrtc/common_audio/audio_converter.h
index 01dad4dfc89699976efd8b5e6925cf5d332725a0..d3c65acee17f6207984033d05abeabd8bac06468 100644
--- a/webrtc/common_audio/audio_converter.h
+++ b/webrtc/common_audio/audio_converter.h
@@ -31,7 +31,7 @@ class AudioConverter {
                                                 size_t src_frames,
                                                 size_t dst_channels,
                                                 size_t dst_frames);
-  virtual ~AudioConverter() {};
+  virtual ~AudioConverter() {}
 
   // Convert |src|, containing |src_size| samples, to |dst|, having a sample
   // capacity of |dst_capacity|. Both point to a series of buffers containing