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Revert "Make List.skip, List.take and List.reversed return Iterables, not Lists." This reverts commit 44c3745a76acfad3d1d5bfc7a8b8c8e2def30e09. Revert "Remove deprecated mappedBy." This reverts commit 779ab69eab73e5e349245e99560b18955908e0cc. BUG=dartbug.com/8560 Review URL: https://codereview.chromium.org//12286004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@18591 260f80e4-7a28-3924-810f-c04153c831b5