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Currently the ExtensionAPITest.ActiveTab fails with the RuntimeHostPermissions
feature since it assumes that the active tab access grant is revoked when the
page is navigated. However, with the runtime host permissions feature enabled,
the active tab grant is only revoked when the page navigates to a different
origin. Fix the test and also test the behavior with RuntimeHostPermissions
enabled.

This is in preparation of enabling RuntimeHostPermissions for field trial
testing.

BUG=888158

Change-Id: I46c2c1f92d273eff80395642d0fe2733528cdf70
Reviewed-on: https://chromium-review.googlesource.com/1239210
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593691}