This makes it possible to run GN for the iOS build, which is being worked on for Chromium. For the command below to work https://codereview.chromium.org/1314413006/ needs to be rolled into WebRTC. TESTED=gn gen out/Default --args="build_with_chromium=false target_os=\"ios\"" BUG=chromium:459705 R=dpranke@chromium.org Review URL: https://codereview.webrtc.org/1309663007 . Cr-Commit-Position: refs/heads/master@{#9912}