Remove dart backend

test/dart_codegen/expect/convert/converter.dart

Index: test/dart_codegen/expect/convert/converter.dart
diff --git a/test/dart_codegen/expect/convert/converter.dart b/test/dart_codegen/expect/convert/converter.dart
deleted file mode 100644
index 70171087bc55d41ec555b4f1996b8da7f6e02cb0..0000000000000000000000000000000000000000
--- a/test/dart_codegen/expect/convert/converter.dart
+++ /dev/null
@@ -1,21 +0,0 @@
-part of dart.convert;
- abstract class Converter<S, T> implements StreamTransformer<S, T> {const Converter();
- T convert(S input);
- Converter<S, dynamic> fuse(Converter<T, dynamic> other) {
-  return new _FusedConverter<S, T, dynamic>(this, other);
-  }
- ChunkedConversionSink startChunkedConversion(Sink<T> sink) {
-  throw new UnsupportedError("This converter does not support chunked conversions: $this");
-  }
- Stream<T> bind(Stream<S> source) {
-  return new Stream<T>.eventTransformed(source, (EventSink sink) => new _ConverterStreamEventSink(this, sink));
-  }
-}
- class _FusedConverter<S, M, T> extends Converter<S, T> {final Converter _first;
- final Converter _second;
- _FusedConverter(this._first, this._second);
- T convert(S input) => ((__x2) => DEVC$RT.cast(__x2, dynamic, T, "CompositeCast", """line 58, column 25 of dart:convert/converter.dart: """, __x2 is T, false))(_second.convert(_first.convert(input)));
- ChunkedConversionSink startChunkedConversion(Sink<T> sink) {
-return _first.startChunkedConversion(_second.startChunkedConversion(sink));
-}
-}