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For macOS, when the updater self updates, it uses the .install.sh
script, and this CL should fix a bug in running the script properly.

Change-Id: Ib745fbb3e998fc864ab61a8f9aba99f432c6e757
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441007Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Michael Chang <donchan@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#812134}