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The files used for FormStructureBrowserTest are snapshots of real web
sites. They can have link to online resources but should not need them
for the test to pass.
But if the network is really bad, the page can wait for the resource
loading to finish and timeout.
Preventing the resource loading will make the test faster and more
robust.

Bug: 896173
Change-Id: I78f180aca959c50996b1af932cc31c1690795038
Reviewed-on: https://chromium-review.googlesource.com/c/1343089
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610079}