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host_tools is already in deps, so this shouldn't be necessary.  The only
case where this makes a difference is if someone manually touches the built
executable in the build dir.

Bug: none
Change-Id: I6abd3143bf0ec9b17f7ff3fc0f6681a80dff5827
Reviewed-on: https://chromium-review.googlesource.com/990497Reviewed-by: Albert J. Wong <ajwong@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547595}