Make .gni files always use LF endings. This saves a lot of spam about dirty git formatting when changing .gni files. Bug: angleproject:3139 Change-Id: I244d5254ac6bd7bd1a7bedac5c34bd141fe0b9c0 Reviewed-on: https://chromium-review.googlesource.com/c/1460611 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>