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This reverts commit 7cd54377.

Reason for revert: https://bugs.chromium.org/p/chromium/issues/detail?id=770001: PrefHashBrowserTestUnchangedCustomInstance browser_tests are failing on "Linux64/Win32&64/Mac64 - trunk" 

Original change's description:
> Reland "Extension content verification: unify "is from store" logic"
> 
> (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/698985
> Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
> Commit-Queue: proberge <proberge@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#506422}

TBR=lazyboy@chromium.org,rdevlin.cronin@chromium.org,proberge@chromium.org

Change-Id: I55c8e8de6077788b1833457f660aca9299710815
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 766806
Reviewed-on: https://chromium-review.googlesource.com/701318Reviewed-by: proberge <proberge@chromium.org>
Commit-Queue: proberge <proberge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506612}