Fix dangling ddc references in libraries.dart

pkg/dev_compiler/tool/sdk_expected_errors.txt

Index: pkg/dev_compiler/tool/sdk_expected_errors.txt
diff --git a/pkg/dev_compiler/tool/sdk_expected_errors.txt b/pkg/dev_compiler/tool/sdk_expected_errors.txt
index 9badbd3f08cbaf8bc7ce022f4b3314be7368ef25..a9bd363bc87e2b951724acb0d47db25701fda687 100644
--- a/pkg/dev_compiler/tool/sdk_expected_errors.txt
+++ b/pkg/dev_compiler/tool/sdk_expected_errors.txt
@@ -40,7 +40,6 @@
 [error] Invalid override. The type of 'ZLibEncoder.startChunkedConversion' ('(Sink<List<int>>) → ByteConversionSink') isn't a subtype of 'ChunkedConverter<List<int>, List<int>, List<int>, List<int>>.startChunkedConversion' ('(dynamic) → dynamic'). (dart:io/data_transformer.dart, line 370, col 3)
 [error] The argument type '(RandomAccessFile) → Future<RandomAccessFile>' can't be assigned to the parameter type '(RandomAccessFile) → FutureOr<File>'. (dart:io/file_impl.dart, line 216, col 30)
 [error] The return type 'Future' isn't a 'FutureOr<File>', as defined by the method ''. (dart:io/file_impl.dart, line 614, col 14)
-[error] Target of URI doesn't exist: 'dart:nativewrappers'. (dart:io, line 211, col 8)
 [error] Undefined name 'lineMode'. (dart:io/stdio.dart, line 64, col 10)
 [error] The name 'echoMode=' is already defined. (dart:io/stdio.dart, line 128, col 12)
 [error] The name 'lineMode=' is already defined. (dart:io/stdio.dart, line 149, col 12)