Merged OWNERS of JS demo directories

This allows Sam Dutton to maintain code samples, and demo managers to
modify js/base/adapter.js.

BUG=
R=henrika@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/5549006

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5257 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed