Convert some more things to size_t.

These changes stem from requests by Andrew on https://codereview.webrtc.org/1228823002/ to eliminate some "return -1"s and change to using asserts plus returning size_ts.  I then also converted the relevant connected bits.

This also cleans up a bunch of style issues, e.g. no spaces around operators.

BUG=chromium:81439
TEST=none
R=andrew@webrtc.org, henrik.lundin@webrtc.org, niklas.enbom@webrtc.org

Review URL: https://codereview.webrtc.org/1305983003 .

Cr-Commit-Position: refs/heads/master@{#9813}
diff --git a/webrtc/modules/audio_coding/codecs/ilbc/defines.h b/webrtc/modules/audio_coding/codecs/ilbc/defines.h
index 5fcd4a0..2faaea1 100644
--- a/webrtc/modules/audio_coding/codecs/ilbc/defines.h
+++ b/webrtc/modules/audio_coding/codecs/ilbc/defines.h
@@ -213,7 +213,7 @@
   /* enhancer state information */
   int use_enhancer;
   int16_t enh_buf[ENH_BUFL+ENH_BUFL_FILTEROVERHEAD];
-  int16_t enh_period[ENH_NBLOCKS_TOT];
+  size_t enh_period[ENH_NBLOCKS_TOT];
 
 } IlbcDecoder;