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* migrates error filtering from a predicate to a process that can customize severities. * moves filtering/processing from the `dart` task into the `getErrors` request and the errors notification. See: https://github.com/dart-lang/sdk/issues/24452 (Pending a thumbs-up, support for CLI to follow.) R=brianwilkerson@google.com Review URL: https://codereview.chromium.org/1517723002 .