25459 Roll Dart SDK from b9471aadaa1a to 9704370488b0 (1 revision) (cla: yes, waiting for tree to go green)

25460 Roll Skia from c8c573d455f0 to 601abfacc736 (8 revisions) (cla: yes, waiting for tree to go green)

25461 Roll Skia from 601abfacc736 to d986f476ae68 (5 revisions) (cla: yes, waiting for tree to go green)

25462 Revert “Reland: Call Dart plugin registrant if available (#23813)” (cla: yes, waiting for tree to go green)