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Now that PDFium has APIs to return float values, use them in conjunction
with gfx::SizeF to simplify CalculateScaleFactor() and related code.

Change-Id: I8d8e96c05db5eb6225e9f0a332b69706fa5a2d5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1954770
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723589}