This CL removes the following no-op and/or unused methods from AudioCodingModule and AudioCodingModuleImpl: ConfigISACBandwidthEstimator DecoderEstimatedBandwidth IsInternalDTXReplacedWithWebRtc REDPayloadISAC ReplaceInternalDTXWithWebRtc ResetDecoder ResetEncoder SendBitrate SetReceivedEstimatedBandwidth R=henrik.lundin@webrtc.org Review URL: https://codereview.webrtc.org/1308283003 . Cr-Commit-Position: refs/heads/master@{#9773}