Unify ClassElement and TypedefElement.

lib/compiler/implementation/typechecker.dart

 // Copyright (c) 2012, 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.
 
 class TypeCheckerTask extends CompilerTask {
   TypeCheckerTask(Compiler compiler) : super(compiler);
   String get name() => "Type checker";
 
   static final bool LOG_FAILURES = false;
 
@@ skipping 12 matching lines @@
     });
   }
 }
 
 interface Type {
   SourceString get name();
   Element get element();
 }
 
 class TypeVariableType implements Type {
-  final SourceString name;
-  TypeVariableElement element;
-  TypeVariableType(this.name, [this.element]);
+  final TypeVariableElement element;
+
+  TypeVariableType(this.element);
+
+  SourceString get name() => element.name;
 
   toString() => name.slowToString();
 }
 
 /**
  * A statement type tracks whether a statement returns or may return.
  */
 class StatementType implements Type {
   final String stringName;
   Element get element() => null;
@@ skipping 726 matching lines @@
   }
 
   visitCatchBlock(CatchBlock node) {
     return unhandledStatement();
   }
 
   visitTypedef(Typedef node) {
     return unhandledStatement();
   }
 }