Update audio code to use size_t more correctly, webrtc/common_audio/ portion.

webrtc/common_audio/real_fourier_ooura.h

Index: webrtc/common_audio/real_fourier_ooura.h
diff --git a/webrtc/common_audio/real_fourier_ooura.h b/webrtc/common_audio/real_fourier_ooura.h
index 67b3ffd77bf7355263c038e7d7bcd4ace44a4407..8d094bf49434e828b0b8033b3cf750e8ee39b099 100644
--- a/webrtc/common_audio/real_fourier_ooura.h
+++ b/webrtc/common_audio/real_fourier_ooura.h
@@ -31,11 +31,11 @@ class RealFourierOoura : public RealFourier {
 
  private:
   const int order_;
-  const int length_;
-  const int complex_length_;
+  const size_t length_;
+  const size_t complex_length_;
   // These are work arrays for Ooura. The names are based on the comments in
   // fft4g.c.
-  const rtc::scoped_ptr<int[]> work_ip_;
+  const rtc::scoped_ptr<size_t[]> work_ip_;
   const rtc::scoped_ptr<float[]> work_w_;
 };