Move some core classes to collection library.

Review URL: https://codereview.chromium.org//11867024

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@17352 260f80e4-7a28-3924-810f-c04153c831b5
1 file changed
tree: 8240efcd0fc61ee842164abe9c82c1b2384a3b71
  1. lib/
  2. test/
  3. pubspec.yaml