Delete several unused GYP scripts from build/mac and chrome/tools/build/mac.

This also adds rsesek@ as an OWNER of chrome/tools/build/mac.

BUG=615107
R=mark@chromium.org
TBR=thakis@chromium.org

Review-Url: https://codereview.chromium.org/2793433002
Cr-Commit-Position: refs/heads/master@{#460981}
10 files changed