Change TemporaryAddressSpoof test to not depend on PDF OpenActions.

OpenActions that navigate to URIs are going to be blocked when
https://pdfium-review.googlesource.com/c/pdfium/+/42731 relands.
It was reverted because this test was breaking and blocking the
pdfium roll into chromium.

The test will now click on a link in the PDF that navigates to the
URI.

Bug: 851821
Change-Id: I49853e99de7b989858b1962ad4a92a4168d4c2db
Reviewed-on: https://chromium-review.googlesource.com/c/1244367
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596011}