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This CL converts 2 tests in url_opener_unittest.mm from unit tests to
integreation tests.
The unit tests were poor tests because:
1) They test the logic inside URLOpener as well as MainController
2) They expose BVC as settable public API in MainController for testing
3) They expose private tab creation API in BVC for testing

Change-Id: Ie442c7ba26d15350f4a13761a32c1666fdb764f8
Reviewed-on: https://chromium-review.googlesource.com/c/1334850
Commit-Queue: edchin <edchin@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608055}