This CL removes the default module owned by ViEEncoder, functionality in the module to register default modules and the final changes in rtp_rtcp_impl using default/child modules. BUG=769 R=pbos@webrtc.org Review URL: https://webrtc-codereview.appspot.com/42509004 Cr-Commit-Position: refs/heads/master@{#8514} git-svn-id: http://webrtc.googlecode.com/svn/trunk@8514 4adac7df-926f-26a2-2b94-8c16560cd09d