Enable cpplint and fix cpplint errors in webrtc/*audio

webrtc/common_audio/real_fourier.h

Index: webrtc/common_audio/real_fourier.h
diff --git a/webrtc/common_audio/real_fourier.h b/webrtc/common_audio/real_fourier.h
index 5e83e37f70ebfbde2f3918c9e17a252dde1529db..1b851e919e20b7db056f8dd92a4227bfa1ac285c 100644
--- a/webrtc/common_audio/real_fourier.h
+++ b/webrtc/common_audio/real_fourier.h
@@ -35,7 +35,7 @@ class RealFourier {
   // Construct a wrapper instance for the given input order, which must be
   // between 1 and kMaxFftOrder, inclusively.
   static std::unique_ptr<RealFourier> Create(int fft_order);
-  virtual ~RealFourier() {};
+  virtual ~RealFourier() {}
 
   // Helper to compute the smallest FFT order (a power of 2) which will contain
   // the given input length.