Fixing WebRTC engine demo JNI symbol export.
Fixing WebRTC engine demo JNI symbol export.

R=henrika@webrtc.org
BUG=None

Review URL: https://webrtc-codereview.appspot.com/39269004

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@8474 4adac7df-926f-26a2-2b94-8c16560cd09d

svn2github/webrtc-Revision-8758,svn2github/webrtc-Revision-8758,svn2github/webrtc-Revision-8758,svn2github/webrtc-Revision-8758,svn2github/webrtc-Revision-8758,svn2github/webrtc-Revision-8758