Element model cleanup + prepare for easier reimplementation.

pkg/compiler/lib/src/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 83 matching lines @@
   accept(ElementVisitor visitor, arg) {
     return visitor.visitClassElement(this, arg);
   }
 
   PartialClassElement copyWithEnclosing(CompilationUnitElement enclosing) {
     return new PartialClassElement(name, beginToken, endToken, enclosing, id);
   }
 }
 
 class MemberListener extends NodeListener {
-  final ClassElement enclosingClass;
+  final ClassElementX enclosingClass;
 
   MemberListener(DiagnosticListener listener,
-                 ClassElement enclosingElement)
+                 ClassElementX enclosingElement)
       : this.enclosingClass = enclosingElement,
         super(listener, enclosingElement.compilationUnit);
 
   bool isConstructorName(Node nameNode) {
     if (enclosingClass == null ||
         enclosingClass.kind != ElementKind.CLASS) {
       return false;
     }
     String name;
     if (nameNode.asIdentifier() != null) {
@@ skipping 118 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));
   }
 }