Fix PDF Viewer build with XFA enabled.

PDFium removed FPDF_LPFILEHANDLER recently, but we forgot to update the
Chromium side, which still had a FPDF_LPFILEHANDLER reference.

Bug: 1033965
Change-Id: I0c06c777d9ab46da232a500d42479d2688c2c39c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1967568
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#724695}
2 files changed