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In this CL, we make code changes to revoke extension's permission when
updating to incognito mode. We also add a unit test to verify the
expected behavior.

Bug: 633706
Change-Id: I617092c1ed954b7d10b71f8d61a08154657f9262
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2293077
Commit-Queue: Ghazale Hosseinabadi <ghazale@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791511}