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Defining providers in the base module can improve startup performance
by giving the chrome split more time to preload. Now that all providers
have been moved to the base module, this CL adds a check to make sure
we don't accidentally add any in another module.

Bug: 1150600
Change-Id: Ifd49034cbf7f1fce1ad2dd7d562b520e0876e93b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2591725Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837460}