Remove dart backend

test/dart_codegen/expect/collection/collection

Index: test/dart_codegen/expect/collection/collection
diff --git a/test/dart_codegen/expect/collection/collection b/test/dart_codegen/expect/collection/collection
deleted file mode 100644
index 617ae537c345e84a91de82f6c0901d224cd8817d..0000000000000000000000000000000000000000
--- a/test/dart_codegen/expect/collection/collection
+++ /dev/null
@@ -1,17 +0,0 @@
-library dart.collection;
-import 'package:dev_compiler/runtime/dart_logging_runtime.dart' as DEVC$RT;
-import 'dart:_internal';
- import 'dart:math' show Random;
-part 'collections.dart';
- part 'hash_map.dart';
- part 'hash_set.dart';
- part 'iterable.dart';
- part 'iterator.dart';
- part 'linked_hash_map.dart';
- part 'linked_hash_set.dart';
- part 'linked_list.dart';
- part 'list.dart';
- part 'maps.dart';
- part 'queue.dart';
- part 'set.dart';
- part 'splay_tree.dart';