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Broken at
  https://chromium-review.googlesource.com/c/chromium/src/+/2417091

The build configuration that provides the PDF_ENABLE_XFA symbol does
not appear to be present for files at the pdf/ directory level, only
for those at the pdf/pdfium/ directory level. To avoid requiring these
definitions at a higher level (since this minimizes recompilation when
the value changes), add a helper function in pdf/pdfium/ to return this
information.

Change-Id: I2499816aa9e5ac08c7064a961d2ed4f70c7772f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575042
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: K. Moon <kmoon@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833832}