Add HE AAC support to ISO BMFF.

media/mp4/avc.cc

Index: media/mp4/avc.cc
diff --git a/media/mp4/avc.cc b/media/mp4/avc.cc
index faf9939cf966b1aa1769cf7624e6fd1005fe08ee..29994661387e3448af446958842323bfd09553a2 100644
--- a/media/mp4/avc.cc
+++ b/media/mp4/avc.cc
@@ -88,27 +88,5 @@ bool AVC::InsertParameterSets(const AVCDecoderConfigurationRecord& avc_config,
   return true;
 }
 
-// static
-ChannelLayout AVC::ConvertAACChannelCountToChannelLayout(int count) {
-  switch (count) {
-    case 1:
-      return CHANNEL_LAYOUT_MONO;
-    case 2:
-      return CHANNEL_LAYOUT_STEREO;
-    case 3:
-      return CHANNEL_LAYOUT_SURROUND;
-    case 4:
-      return CHANNEL_LAYOUT_4_0;
-    case 5:
-      return CHANNEL_LAYOUT_5_0;
-    case 6:
-      return CHANNEL_LAYOUT_5_1;
-    case 8:
-      return CHANNEL_LAYOUT_7_1;
-    default:
-      return CHANNEL_LAYOUT_UNSUPPORTED;
-  }
-}
-
 }  // namespace mp4
 }  // namespace media