Revert of AcmReceiver: Ask NetEq to delete all decoders at once instead of one by one

webrtc/modules/audio_coding/neteq/decoder_database.cc

Index: webrtc/modules/audio_coding/neteq/decoder_database.cc
diff --git a/webrtc/modules/audio_coding/neteq/decoder_database.cc b/webrtc/modules/audio_coding/neteq/decoder_database.cc
index f5fbad34460d7dcaf48c69897659af05791884cc..b189e4bb562ae77872ce3380dfbb977d3bd4756a 100644
--- a/webrtc/modules/audio_coding/neteq/decoder_database.cc
+++ b/webrtc/modules/audio_coding/neteq/decoder_database.cc
@@ -169,12 +169,6 @@
   return kOK;
 }
 
-void DecoderDatabase::RemoveAll() {
-  decoders_.clear();
-  active_decoder_type_ = -1;      // No active decoder.
-  active_cng_decoder_type_ = -1;  // No active CNG decoder.
-}
-
 const DecoderDatabase::DecoderInfo* DecoderDatabase::GetDecoderInfo(
     uint8_t rtp_payload_type) const {
   DecoderMap::const_iterator it = decoders_.find(rtp_payload_type);