Remove vim/emacs modelines from .gypi files

BUG=1655

Review URL: https://webrtc-codereview.appspot.com/1326005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@3857 4adac7df-926f-26a2-2b94-8c16560cd09d
25 files changed