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Updates tests that call these functions to use gfx equivalents. Make
direct conversions when possible. For pp::PDF structs used as test
expectations, clone the structs and switch the clones to use gfx::RectF
instead of pp::FloatRect. Then call RectFFromPPFloatRect() on the actual
pp::PDF rects from production code to make comparisons possible.

Bug: 1101101
Change-Id: I82f5d19a0cf0c355a45f57370120e071fe08a018
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425746
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Ankit Kumar 🌪️ <ankk@microsoft.com>
Reviewed-by: K. Moon <kmoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809977}