Besides being a good idea in general, this lets us use the good chromium_code==1 warning settings on Mac and Windows. Straight rename except for a change to use os_posix in the gyp files. Review URL: http://webrtc-codereview.appspot.com/88011 git-svn-id: http://webrtc.googlecode.com/svn/trunk@282 4adac7df-926f-26a2-2b94-8c16560cd09d