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This is a reland of d15dd85f

Original change's description:
> [Reland] Block resources in FormStructureBrowserTest.
>
> 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: I16b02e1d7defd4d950e6ee4cd21bd0133b9ac957
> Reviewed-on: https://chromium-review.googlesource.com/c/1346462
> Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
> Reviewed-by: Eugene But <eugenebut@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#610366}

Tbr: eugenebut@chromium.org
Bug: 896173
Change-Id: I713942404ec5ab47fb653f4fc2c04214f66fa866
Reviewed-on: https://chromium-review.googlesource.com/c/1348032Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610407}