Merge to XFA: DEPS include_rules no longer allows core/ -> fpsdfsk/ inclusion.

Original Review URL: https://codereview.chromium.org/1411493002 .
(cherry picked from commit 8316a8a0274558f7a0f515e04bb13a7cca5762b2)

BUG=pdfium:217
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/1405243004 .
4 files changed