restore arrow function bind this workaround

tool/sdk_expected_errors.txt

Index: tool/sdk_expected_errors.txt
diff --git a/tool/sdk_expected_errors.txt b/tool/sdk_expected_errors.txt
index 337800890ccb1419fec5ba4a82b0a46fd9f62082..ccf1943b820f4cfee9bb5cea143f076caf2c6cd9 100644
--- a/tool/sdk_expected_errors.txt
+++ b/tool/sdk_expected_errors.txt
@@ -375,10 +375,10 @@ warning: [DownCastImplicit] list (Object) will need runtime check to cast to typ
 warning: [DownCastComposite] callMethod('splice', [index, 1])[0] (dynamic) will need runtime check to cast to type E (dart:js, line 404, col 12)
 warning: [DownCastComposite] callMethod('pop') (dynamic) will need runtime check to cast to type E (dart:js, line 409, col 12)
 warning: [DownCastImplicit] ms (num) will need runtime check to cast to type int (dart:js, line 486, col 52)
-severe: [AnalyzerMessage] Missing concrete implementation of getter 'TypeMirror.typeArguments', getter 'TypeMirror.isOriginalDeclaration', getter 'DeclarationMirror.owner', getter 'DeclarationMirror.location' and 10 more (dart:_js_mirrors, line 120, col 7)
-severe: [AnalyzerMessage] Missing concrete implementation of getter 'InstanceMirror.type', getter 'InstanceMirror.hasReflectee' and 'InstanceMirror.delegate' (dart:_js_mirrors, line 47, col 7)
-severe: [AnalyzerMessage] Missing concrete implementation of getter 'VariableMirror.isStatic', getter 'VariableMirror.isFinal', getter 'DeclarationMirror.owner', getter 'ParameterMirror.isOptional' and 9 more (dart:_js_mirrors, line 126, col 7)
-severe: [AnalyzerMessage] Missing concrete implementation of getter 'TypeMirror.typeArguments', getter 'ClassMirror.superinterfaces', getter 'TypeMirror.isOriginalDeclaration', getter 'ClassMirror.staticMembers' and 19 more (dart:_js_mirrors, line 84, col 7)
-severe: [AnalyzerMessage] Missing concrete implementation of getter 'MethodMirror.isSetter', getter 'MethodMirror.isConstructor', getter 'MethodMirror.isConstConstructor', getter 'MethodMirror.isAbstract' and 17 more (dart:_js_mirrors, line 134, col 7)
-severe: [AnalyzerMessage] The argument type 'void' cannot be assigned to the parameter type 'Object' (dart:_js_mirrors, line 61, col 35)
+severe: [AnalyzerMessage] Missing concrete implementation of getter 'TypeMirror.typeArguments', getter 'TypeMirror.isOriginalDeclaration', getter 'DeclarationMirror.owner', getter 'DeclarationMirror.location' and 10 more (dart:_js_mirrors, line 116, col 7)
+severe: [AnalyzerMessage] Missing concrete implementation of getter 'InstanceMirror.type', getter 'InstanceMirror.hasReflectee' and 'InstanceMirror.delegate' (dart:_js_mirrors, line 43, col 7)
+severe: [AnalyzerMessage] Missing concrete implementation of getter 'VariableMirror.isStatic', getter 'VariableMirror.isFinal', getter 'DeclarationMirror.owner', getter 'ParameterMirror.isOptional' and 9 more (dart:_js_mirrors, line 122, col 7)
+severe: [AnalyzerMessage] Missing concrete implementation of getter 'TypeMirror.typeArguments', getter 'ClassMirror.superinterfaces', getter 'TypeMirror.isOriginalDeclaration', getter 'ClassMirror.staticMembers' and 19 more (dart:_js_mirrors, line 80, col 7)
+severe: [AnalyzerMessage] Missing concrete implementation of getter 'MethodMirror.isSetter', getter 'MethodMirror.isConstructor', getter 'MethodMirror.isConstConstructor', getter 'MethodMirror.isAbstract' and 17 more (dart:_js_mirrors, line 130, col 7)
+severe: [AnalyzerMessage] The argument type 'void' cannot be assigned to the parameter type 'Object' (dart:_js_mirrors, line 57, col 35)
 warning: [DownCastImplicit] (tm as ClassMirror).originalDeclaration (TypeMirror) will need runtime check to cast to type ClassMirror (dart:mirrors, line 171, col 10)