Remove ASSERT_NOT_REACHED() in audio.

BUG=596760

Review-Url: https://codereview.chromium.org/2604683002
Cr-Commit-Position: refs/heads/master@{#441610}
diff --git a/AUTHORS b/AUTHORS
index e6615048..d575521f 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -247,6 +247,7 @@
 Gyuyoung Kim <[email protected]>
 Gzob Qq <[email protected]>
 Habib Virji <[email protected]>
+Haeun Kim <[email protected]>
 Haitao Feng <[email protected]>
 Halley Zhao <[email protected]>
 Halton Huo <[email protected]>