Remove henrike@ from OWNERS

Since he has left the team.

R=henrike@webrtc.org, tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/48789004

Cr-Original-Commit-Position: refs/heads/master@{#8913}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 722ef1fb59878dbf6d05b3492bd41d9a66d68620
11 files changed