WebRtc_Word32 -> int32_t in audio_processing/

BUG=314

Review URL: https://webrtc-codereview.appspot.com/1307004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3809 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_processing/include/audio_processing.h b/webrtc/modules/audio_processing/include/audio_processing.h
index 5e0c02c..510b1a0 100644
--- a/webrtc/modules/audio_processing/include/audio_processing.h
+++ b/webrtc/modules/audio_processing/include/audio_processing.h
@@ -253,8 +253,8 @@
   };
 
   // Inherited from Module.
-  virtual WebRtc_Word32 TimeUntilNextProcess() { return -1; }
-  virtual WebRtc_Word32 Process() { return -1; }
+  virtual int32_t TimeUntilNextProcess() { return -1; }
+  virtual int32_t Process() { return -1; }
 };
 
 // The acoustic echo cancellation (AEC) component provides better performance