Removes dartc reliance on its own libraries, now can be targeted at any implementation's libraries

compiler/lib/print.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// TODO(ngeoffray): define native top-level methods once top-level
-// methods work with the resolver.
-typedef void _PrintType(arg);
-
-_PrintType get print() {
-  return _Logger.print;
-}
-
-class _Logger {
-  static print(arg) {
-    _printString((arg === null) ? "null" : arg.toString());
-  }
-
-  static void _printString(String str) native;
-}