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Migrate all instances of pp::Point to gfx::Point/gfx::Vector2d at
PDFEngine interface. The internals still have pp::Point dependency but
the interface is now independent of pp::Point. The internal dependency
will be migrated in a subsequent CL.

Bug: 1101101
Change-Id: Ib8a729314ec6101183281235d35afc697a243b03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2326512Reviewed-by: K. Moon <kmoon@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Ankit Kumar 🌪️ <ankk@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#799361}