Reland r9159 "Adding a new constraint to set NetEq buffer capacity ..."

This reverts commit cdb47a4533b7b1e29e803ed6591a68bb1a4f1692.

Contains a tentative fix to the chrome build breakage caused by the
original change.

TBR=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/47139004

Cr-Commit-Position: refs/heads/master@{#9164}

webrtc/modules/audio_coding/main/interface/audio_coding_module.h

@@ -99,6 +99,7 @@ class AudioCodingModule {
   //
   static AudioCodingModule* Create(int id);
   static AudioCodingModule* Create(int id, Clock* clock);
+  static AudioCodingModule* Create(const Config& config);
   virtual ~AudioCodingModule() {};
 
   ///////////////////////////////////////////////////////////////////////////