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Tests are added to Extensions Tabs API to ensure extensions cannot
create or query the tabs in incognito mode when they are not enabled
to run there.

Bug: 862075
Change-Id: I6081b4cc432c82d147a65f30311af0708efe03f9
Reviewed-on: https://chromium-review.googlesource.com/1158368
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582514}