iLBC: Handle a case of bad input data

We detect an unreasonable state (caused by a bad encoded stream)
before it can lead to problems, and handle it by resetting the
decoder.

NOPRESUBMIT=true
BUG=chromium:617124

Review-Url: https://codereview.webrtc.org/2255203002
Cr-Commit-Position: refs/heads/master@{#13888}

webrtc/modules/audio_coding/BUILD.gn

@@ -446,6 +446,7 @@ source_set("ilbc") {
   deps = [
     ":audio_decoder_interface",
     ":audio_encoder_interface",
+    "../../base:rtc_base_approved",
     "../../common_audio",
   ]
 }