This is for comments in
https://crrev.com/c/2629087/11/autoninja
and
https://crrev.com/c/2629087/11/autoninja.bat

Change-Id: I2edafaee7916b7c826af7a7f8f0150a541c8d098
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2631396Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Fumitoshi Ukai <ukai@google.com>
Reviewed-by: Yoshisato Yanagisawa <yyanagisawa@google.com>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>