Fix ChromeOS build (C99 break)

webrtc/modules/audio_coding/codecs/ilbc/nearest_neighbor.c

Index: webrtc/modules/audio_coding/codecs/ilbc/nearest_neighbor.c
diff --git a/webrtc/modules/audio_coding/codecs/ilbc/nearest_neighbor.c b/webrtc/modules/audio_coding/codecs/ilbc/nearest_neighbor.c
index af0404537fd3384bc6a7456bc71b273398c6eae9..2b58abc4f94c74cbf22ee9426918c6dee561828e 100644
--- a/webrtc/modules/audio_coding/codecs/ilbc/nearest_neighbor.c
+++ b/webrtc/modules/audio_coding/codecs/ilbc/nearest_neighbor.c
@@ -22,8 +22,9 @@ void WebRtcIlbcfix_NearestNeighbor(size_t* index,
                                    const size_t* array,
                                    size_t value,
                                    size_t arlength) {
+  size_t i;
   size_t min_diff = (size_t)-1;
-  for (size_t i = 0; i < arlength; i++) {
+  for (i = 0; i < arlength; i++) {
     const size_t diff =
         (array[i] < value) ? (value - array[i]) : (array[i] - value);
     if (diff < min_diff) {