WebRtc_Word32 -> int32_t in utility/

BUG=314

Review URL: https://webrtc-codereview.appspot.com/1307005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3797 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/utility/interface/process_thread.h b/webrtc/modules/utility/interface/process_thread.h
index 6c51404..3e25bd0 100644
--- a/webrtc/modules/utility/interface/process_thread.h
+++ b/webrtc/modules/utility/interface/process_thread.h
@@ -22,11 +22,11 @@
     static ProcessThread* CreateProcessThread();
     static void DestroyProcessThread(ProcessThread* module);
 
-    virtual WebRtc_Word32 Start() = 0;
-    virtual WebRtc_Word32 Stop() = 0;
+    virtual int32_t Start() = 0;
+    virtual int32_t Stop() = 0;
 
-    virtual WebRtc_Word32 RegisterModule(const Module* module) = 0;
-    virtual WebRtc_Word32 DeRegisterModule(const Module* module) = 0;
+    virtual int32_t RegisterModule(const Module* module) = 0;
+    virtual int32_t DeRegisterModule(const Module* module) = 0;
 protected:
     virtual ~ProcessThread();
 };