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Since it is out of src by default, it is not possible for us to provide
hermetic compile.  Let me make that within Chromium src.

Bug: 1015730
Change-Id: I4283a6ccf54d8f30401a6ad3f0084b7fe791b2be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2027015
Auto-Submit: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738460}