Initialize PDF SDK with policy in chrome_pdf::RenderPDFPageToDC()

This CL adds a new method `SetUseSkiaRendererPolicy()` to mojom
interface `PdfToEmfConverter` so that the enterprise policy regarding
whether to use Skia as the PDF renderer is set immediately once the
mojom remote is bound.

This change also sets the enterprise policy from the last instance of caller of chrome_pdf::GetPDFDocInfo(), therefore remove the TODO
comment for chrome_pdf::GetPDFDocInfo().

Bug: 1440430
Change-Id: I2ab78a76447d2566f596fd078e9f655e1006bbe4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4540682


Reviewed-by: Chris Bookholt <bookholt@chromium.org>
Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Nigi <nigi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1146679}