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This is a reland of c2b6797f

Fixed to add CALLBACK in front of the callback function.

Original change's description:
> Add test that verifies CFG loader config is generated correctly.
>
> This CL adds a test that creates a callback from operating system
> code to a module that has CFG enabled where the callback is not
> listed as a valid indirect target.
>
> Note: this test does not require dispatch guards to be present
> in chromium code, just for them to be present in OS code and
> for the CFG load config to be generated correctly.
>
> BUG=584575
>
> Change-Id: Id6f5f4061f7237c23f08c8fe1b7471ea200f0628
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308854
> Commit-Queue: Will Harris <wfh@chromium.org>
> Reviewed-by: Alex Gough <ajgo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#790587}

Bug: 584575
Cq-Include-Trybots: luci.chromium.try:win7-rel
Change-Id: Ie721a3f3aebcb3ff1eaae711e588ba1ec8a6e507
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2311038Reviewed-by: Alex Gough <ajgo@chromium.org>
Commit-Queue: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790690}