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In many cases we need Element.getNode() only for producing error. This CL changes these places and well as other places where we can easily use only Elements without getNode(). R=zundel@google.com,brianwilkerson@google.com BUG= TEST= Review URL: https://chromiumcodereview.appspot.com//9692002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@5349 260f80e4-7a28-3924-810f-c04153c831b5