Remove dart2js specific core.dart/coreimpl.dart files.

lib/compiler/implementation/lib/core.dart

Index: lib/compiler/implementation/lib/core.dart
diff --git a/lib/compiler/implementation/lib/core.dart b/lib/compiler/implementation/lib/core.dart
deleted file mode 100644
index 8c01706d308f7a2c68e3e927765349c29686d2a8..0000000000000000000000000000000000000000
--- a/lib/compiler/implementation/lib/core.dart
+++ /dev/null
@@ -1,38 +0,0 @@
-// Copyright (c) 2012, 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.
-
-#library('dart:core');
-
-#import('dart:coreimpl');
-
-#source('../../../../lib/core/bool.dart');
-#source('../../../../lib/core/collection.dart');
-#source('../../../../lib/core/comparable.dart');
-#source('../../../../lib/core/date.dart');
-#source('../../../../lib/core/double.dart');
-#source('../../../../lib/core/duration.dart');
-#source('../../../../lib/core/errors.dart');
-#source('../../../../lib/core/exceptions.dart');
-#source('../../../../lib/core/expando.dart');
-#source('../../../../lib/core/expect.dart');
-#source('../../../../lib/core/function.dart');
-#source('../../../../lib/core/future.dart');
-#source('../../../../lib/core/hashable.dart');
-#source('../../../../lib/core/int.dart');
-#source('../../../../lib/core/iterable.dart');
-#source('../../../../lib/core/iterator.dart');
-#source('../../../../lib/core/list.dart');
-#source('../../../../lib/core/map.dart');
-#source('../../../../lib/core/num.dart');
-#source('../../../../lib/core/object.dart');
-#source('../../../../lib/core/options.dart');
-#source('../../../../lib/core/print.dart');
-#source('../../../../lib/core/pattern.dart');
-#source('../../../../lib/core/queue.dart');
-#source('../../../../lib/core/regexp.dart');
-#source('../../../../lib/core/set.dart');
-#source('../../../../lib/core/stopwatch.dart');
-#source('../../../../lib/core/string.dart');
-#source('../../../../lib/core/string_buffer.dart');
-#source('../../../../lib/core/strings.dart');