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(Not a direct reland: the change to extension_settings_browsertest.h
was not in the original CL)

This is a reland of f3bd7c65
Original change's description:
> Extension content verification: unify "is from store" logic
> 
> Bug: 766806
> Change-Id: I1a210ded77cc9ffdc0039fca097c6fdba7ff0131
> Reviewed-on: https://chromium-review.googlesource.com/677403
> Commit-Queue: proberge <proberge@chromium.org>
> Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#505092}

Bug: 766806
Change-Id: I4a0c69c50d7bc41a47e264ad9b9e3136a729ec96
Reviewed-on: https://chromium-review.googlesource.com/698985Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: proberge <proberge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506422}