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A test is added to check if an extension with command key binding can
not be accessed when it is not allowed in incognito.

Bug: 862075
Change-Id: Id49fb16958a9913978f8b054740c0ef4d0977c25
Reviewed-on: https://chromium-review.googlesource.com/1141727Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579320}