Remove dart backend

test/dart_codegen/expect/core/annotations.dart

Index: test/dart_codegen/expect/core/annotations.dart
diff --git a/test/dart_codegen/expect/core/annotations.dart b/test/dart_codegen/expect/core/annotations.dart
deleted file mode 100644
index 991a63fbba23217242d098bdc75bfb4a1294543c..0000000000000000000000000000000000000000
--- a/test/dart_codegen/expect/core/annotations.dart
+++ /dev/null
@@ -1,24 +0,0 @@
-part of dart.core;
- class JsName {final String name;
- const JsName({
-  this.name}
-);
-}
- class JsPeerInterface {final String name;
- const JsPeerInterface({
-this.name}
-);
-}
- class SupportJsExtensionMethod {const SupportJsExtensionMethod();
-}
- class Deprecated {final String expires;
- const Deprecated(String expires) : this.expires = expires;
- String toString() => "Deprecated feature. Will be removed $expires";
-}
- class _Override {const _Override();
-}
- const Deprecated deprecated = const Deprecated("next release");
- const Object override = const _Override();
- class _Proxy {const _Proxy();
-}
- const Object proxy = const _Proxy();