It is used only here https://github.com/flutter/packages/blob/master/packages/metrics_center/lib/src/common.dart#L16, and that usage could be replaced with straightforward == and hashCode methods.

Removing the dependence would allow including fewer Dart packages in the engine DEPS file: https://github.com/flutter/engine/blob/master/DEPS#L397