Refactoring common_audio: Remove macro WEBRTC_SPL_MEMMOVE_W16

Yet another macro that utilizes a function directly.

BUG=3348,3353
TESTED=locally on linux and trybots
R=kwiberg@webrtc.org, turaj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/18159004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6935 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/common_audio/signal_processing/include/signal_processing_library.h

@@ -117,9 +117,6 @@ extern "C" {
 #define WEBRTC_SPL_MEMCPY_W16(v1, v2, length) \
   memcpy(v1, v2, (length) * sizeof(int16_t))
 
-#define WEBRTC_SPL_MEMMOVE_W16(v1, v2, length) \
-  memmove(v1, v2, (length) * sizeof(int16_t))
-
 // inline functions:
 #include "webrtc/common_audio/signal_processing/include/spl_inl.h"