Move ownership of vie_encoders and vie_channels into the channel group.

BUG=4323
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/44369004

Cr-Commit-Position: refs/heads/master@{#8647}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8647 4adac7df-926f-26a2-2b94-8c16560cd09d
5 files changed