Move end of namespace inside #ifdef

The code did not compile unless WEBRTC_ANDROID was defined.

R=henrike@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/21319004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6989 4adac7df-926f-26a2-2b94-8c16560cd09d