Revert "Get the CertificateInfo of the current exe from ModuleDatabase"

This reverts commit 5a0921ab569ee10d89eca68406bb262f816de7cb.

Reason for revert: Seems to cause ThirdPartyConflictsManagerTest.InitializeUpdaters to fail in official builds.

Original change's description:
> Get the CertificateInfo of the current exe from ModuleDatabase
> 
> The ThirdPartyConflictsManager needs the CertificateInfo of the current
> executable to identify third-party DLLs. It used to create it itself,
> but that information is already available from the ModuleDatabase.
> 
> Bug: 921746
> Change-Id: I3d57d289f17bac563fed498e59f48c3bbc9f4f64
> Reviewed-on: https://chromium-review.googlesource.com/c/1426061
> Reviewed-by: S├ębastien Marchand <sebmarchand@chromium.org>
> Commit-Queue: Patrick Monette <pmonette@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#624901}

TBR=pmonette@chromium.org,sebmarchand@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 921746, 852295
Change-Id: I74a40d6c9af0c41c487e6201581230d537c56daa
Reviewed-on: https://chromium-review.googlesource.com/c/1432233
Reviewed-by: Reid Kleckner <rnk@chromium.org>
Commit-Queue: Reid Kleckner <rnk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625384}
2 files changed