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This allows other callers to use it without including iat_patch_function.h.
Principally, this will be used for the upcoming CoCreateInstance DCHECK.

BUG=708303
TBR=gab@chromium.org
Refactor. No impact to running code.

Change-Id: Ibd25de76a2e9bf858619c6fccc18a46704237067
Reviewed-on: https://chromium-review.googlesource.com/531668
Commit-Queue: Robert Liao <robliao@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478789}