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This cl adds an additional condition of use_sysroot=true to enable the app shell
installer.  This matches the Linux condition [1].

This is needed to fix gn bootstrap for Chromium packagers, who build without the
sysroot.

[1] https://cs.chromium.org/chromium/src/chrome/installer/BUILD.gn

BUG=822321

Change-Id: Iae8ba0576525a51a3be91960deb939c760c80b86
Reviewed-on: https://chromium-review.googlesource.com/966967Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543928}