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LoadUrlAndExpectResponse's use of InterfacePtr is unnecessarily
restrictive given that the function body doesn't interact with channel-
level details directly.

Using an Interface raw pointer is a better fit, and allows callers to
pass in NavigationControllers when a NavigationControllerPtr isn't
available.

Change-Id: Ib1a1fbbc3e9373219971d4290deecf3f33904908
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1590959
Auto-Submit: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656445}