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Clicking back-to-safety will now navigate backward for the malicious
subresource case, which is consistent with Chrome's behavior.

This removes is_resource_cancellable, since it was only added for the
old WebView behavior (see crrev/458833).

BUG=699196

Change-Id: Idb78f514f3ccbc8d899622c3700d71c93fdc7253
Reviewed-on: https://chromium-review.googlesource.com/516803Reviewed-by: Jialiu Lin <jialiul@chromium.org>
Reviewed-by: Adrienne Porter Felt <felt@chromium.org>
Reviewed-by: Selim Gurun <sgurun@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#476510}