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This method was always called synchronously from
ModelAssociationManager::Associate(), so no need for a delegate
method - instead, the one implementation is inlined at the relevant
place.

Bug: 1102837
Change-Id: Ic69b0f93baa5780c76ab95f45904fd2ca9e08b98
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2489642Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819401}