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Owners file generation took more than 25% of full build times in CQ.
Let me enable that only in fuzzing engine build.

Bug: 995151
Change-Id: I4f490ef946ddeb729991cafbf21dd21bb5059920
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761889
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Reviewed-by: Jonathan Metzman <metzman@chromium.org>
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688522}