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The MDM service is disabled in Chromium branded builds, but it can be
enabled in tests via the GoogleMdmEscrowServiceEnablerForTesting class.

The class used to be available only in GOOGLE_CHROME_BUILD builds.
To not use GOOGLE_CHROME_BUILD in a .h file, make the class available
always and make it a no-op in GOOGLE_CHROME builds.

That simplifies a few tests, removes a dependency on the GOOGLE_CHROME_BRANDING
buildflag header target, and makes it easy to remove GOOGLE_CHROME_BUILD
from mdm_utils.h/cc

While here, also remove the unused parameter for
GoogleMdmEscrowServiceEnablerForTesting's constructor.

Bug: 961769
Change-Id: I1dfdbdf056634d1e47272f397c11919193bf7fc3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894295
Commit-Queue: Nico Weber <thakis@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711471}