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On iOS 13, when preloading a PDF, the WebView is getting the focus,
preventing the user from typing in the omnibox.
This CL fixes it by not pre-loading the PDF pages.

Bug: 1017352
Change-Id: Ifd787ee57458df61381fff65eea3b6ed858da874
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1892215Reviewed-by: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712546}