Migration: remove abstract interfaces defined by analysis_server for use by nnbd_migration. These interfaces acted as a temporary bridge to allow analysis server core classes to provide services needed by nnbd_migration without forcing analysis_server to depend on nnbd_migration; that in turn allowed the analysis server to provide migration services to dartfix. Now that we no longer use the analysis server nor dartfix for migration, these interface classes are no longer needed. As of this commit, the nnbd_migration package no longer depends on analysis_server. Change-Id: Ia923d91dd59c9a612000da8b0c9ead8a68686d89 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/148560 Reviewed-by: Mike Fairhurst <mfairhurst@google.com>
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