GitLab

WKWebView was returning a blank PDF when requesting a PDF to get
generated for a loaded PDF (during full page screenshot scenario).

Fix: Disable PDF generation on non-HTML Web states.

Bug: 1131566
Change-Id: Ia5ac045b8ec1335266e98ef8cf7eb00a8c62f0d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2431553
Commit-Queue: Sebastien Lalancette <seblalancette@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810814}