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This CL updates the naming MacNative to MacOs for app service app type
to make the language inclusive.

TBR=xiyuan@chromium.org, sky@chromium.org

Bug: 1097644
Change-Id: I17cf90fb81c4451a6d05f997db205c718f2afabd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2494403Reviewed-by: Maggie Cai <mxcai@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820653}