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FPDF_GetPageSizeByIndexF() is encouraged over the older
FPDF_GetPageSizeByIndex(), which is will be deprecated in the future.

Meanwhile, clean some surrounding code.

Change-Id: Id315c67bec5361f23225e49a0fd1438fbcb92428
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392947
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804507}