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Setting the virtual URL means that all UI surfaces will use the
"original" URL, that is, the origin URL where the content came from.
This should not affect any security features of Chrome, which should
be using the loaded URL, not the virtual one. Security-related UI that
are impacted are addressed as follows:
* Site Settings - explicitly disabled when a preview is shown
* Permissions Dialog - explicitly denied in r1260082

Adds virtual URL testing to HTTPS Previews browser tests and one
additional test for navigation actions.

Bug: 881938
Change-Id: I6e6f2e2a3ef267d61c18295f019d307adc9756bb
Reviewed-on: https://chromium-review.googlesource.com/c/1217351
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599279}