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The ModuleDatabase is the replacement for the EnumerateModulesModel
that is now needed for the IncompatibleApplicationsWarning and
ThirdPartyModulesBlocking features. It has been enabled on all channels
via the experimentation for the incompatible applications warning.

This CL removes the enumerate_modules_model.* files and remove the
ModuleDatabase feature flag. This means that it will now be permanently
enabled.

Bug: 751136
Change-Id: Id49e49ec213dd1a81021346cdd8084ee407f8229
Reviewed-on: https://chromium-review.googlesource.com/1098016
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567441}