Removed ViEBaseObserver.

BUG=1037
TEST=Still compiles and ViE autotest passes.

Review URL: https://webrtc-codereview.appspot.com/929012

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@3052 4adac7df-926f-26a2-2b94-8c16560cd09d
11 files changed