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We never build chrome with this configuration, but there's no reason to
prevent some third-party from building chromium in this manner. In the
absence of a few new #ifdefs, we would get errors like:
  error: use of undeclared identifier 'FPDF_GetRecommendedV8Flags'

Change-Id: I1500dd1aa587707ea81e175254b79a21f1bd6010
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416939
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808194}