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The FPDF_PageToDevice() API does not guarantee specific out-parameter
values when failure is indicated, so avoid using them in subsequent
calculations.

Although this can't happen in the currently shipping chrome, future
changes in PDFium to support XFA might make this possible.

Bug: 1141256
Change-Id: Ib0b9b40ab419b2ea698e0dc6172343fea0ef989c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2491978Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819906}