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After recent cleanups, this method did nothing except maintain
|associated_types_| - which itself wasn't used at all, except for some
DCHECKs, so it's removed now as well.
While we're here, also remove ModelAssociationManager::state_ which
wasn't used (or useful) either anymore.

Bug: 1102837
Change-Id: Id62edd0f4be324fd4449dfd16e2a98530ee0c3d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2494867Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820258}