Remove support for interface in dart2js.

sdk/lib/_internal/compiler/implementation/scanner/class_element_parser.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of scanner;
 
 class ClassElementParser extends PartialParser {
   ClassElementParser(Listener listener) : super(listener);
 
   Token parseClassBody(Token token) => fullParseClassBody(token);
@@ skipping 70 matching lines @@
     SourceString name;
     if (nameNode.asIdentifier() != null) {
       name = nameNode.asIdentifier().source;
     } else {
       Send send = nameNode.asSend();
       name = send.receiver.asIdentifier().source;
     }
     return enclosingElement.name == name;
   }
 
+  // TODO(johnniwinther): Remove this method.
   SourceString getMethodNameHack(Node methodName) {
     Send send = methodName.asSend();
     if (send == null) return methodName.asIdentifier().source;
     Identifier receiver = send.receiver.asIdentifier();
     Identifier selector = send.selector.asIdentifier();
     Operator operator = selector.asOperator();
     if (operator != null) {
       assert(identical(receiver.source.stringValue, 'operator'));
       // TODO(ahe): It is a hack to compare to ')', but it beats
       // parsing the node.
       bool isUnary = identical(operator.token.next.next.stringValue, ')');
       return Elements.constructOperatorName(operator.source, isUnary);
     } else {
       if (receiver == null) {
         listener.cancel('library prefix in named factory constructor not '
                         'implemented', node: send.receiver);
       }
       if (receiver.source != enclosingElement.name) {
-        listener.onDeprecatedFeature(receiver, 'interface factories');
+        listener.reportErrorCode(receiver,
+                                 MessageKind.INVALID_CONSTRUCTOR_NAME,
+                                 {'name': enclosingElement.name});
       }
       return Elements.constructConstructorName(receiver.source,
                                                selector.source);
     }
   }
 
   void endMethod(Token getOrSet, Token beginToken, Token endToken) {
     super.endMethod(getOrSet, beginToken, endToken);
     FunctionExpression method = popNode();
     pushNode(null);
@@ skipping 16 matching lines @@
   }
 
   void endFactoryMethod(Token beginToken, Token endToken) {
     super.endFactoryMethod(beginToken, endToken);
     FunctionExpression method = popNode();
     pushNode(null);
     SourceString name = getMethodNameHack(method.name);
     Identifier singleIdentifierName = method.name.asIdentifier();
     if (singleIdentifierName != null && singleIdentifierName.source == name) {
       if (name != enclosingElement.name) {
-        listener.onDeprecatedFeature(method.name, 'interface factories');
+        listener.reportErrorCode(singleIdentifierName,
+                                 MessageKind.INVALID_UNNAMED_CONSTRUCTOR_NAME,
+                                 {'name': enclosingElement.name});
       }
     }
     ElementKind kind = ElementKind.FUNCTION;
     Element memberElement =
         new PartialFunctionElement(name, beginToken, null, endToken,
                                    kind, method.modifiers, enclosingElement);
     addMember(memberElement);
   }
 
   void endFields(int count, Token beginToken, Token endToken) {
@@ skipping 31 matching lines @@
 
   void endMetadata(Token beginToken, Token periodBeforeName, Token endToken) {
     popNode(); // Discard arguments.
     if (periodBeforeName != null) {
       popNode(); // Discard name.
     }
     popNode(); // Discard node (Send or Identifier).
     pushMetadata(new PartialMetadataAnnotation(beginToken, endToken));
   }
 }