This CL takes care of the re-registration of codecs, and tests unregistering stereo codecs. One bug fixed in Celt too. TEST=audio_coding_module_test: TestStereo. Review URL: https://webrtc-codereview.appspot.com/436002 git-svn-id: http://webrtc.googlecode.com/svn/trunk@1859 4adac7df-926f-26a2-2b94-8c16560cd09d