Remove ExecutableElement.localVariables altogether.

pkg/analyzer/test/dart/element/builder_test.dart

 // Copyright (c) 2014, 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.
 
 library analyzer.test.dart.element.builder_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_ast_factory.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 1003 matching lines @@
           .accept(new ApiElementBuilder(holder, compilationUnitElement));
       main = holder.functions.single as FunctionElementImpl;
     }
     expect(main.functions, isEmpty);
 
     // Build local elements in body.
     ElementHolder holder = new ElementHolder();
     FunctionBody mainBody = mainAst.functionExpression.body;
     mainBody.accept(new LocalElementBuilder(holder, compilationUnitElement));
     main.functions = holder.functions;
-    main.localVariables = holder.localVariables;
+    main.encloseElements(holder.localVariables);
 
     var v1 = findLocalVariable(code, 'v1;');
     var v2 = findLocalVariable(code, 'v2;');
     var v3 = findLocalVariable(code, 'v3;');
 
     expect(v1.enclosingElement, main);
     expect(main.functions, hasLength(1));
     {
       FunctionElement f1 = main.functions[0];
       expect(f1.name, 'f1');
@@ skipping 1604 matching lines @@
     AnalysisEngine.instance.logger = logger;
     try {
       _compilationUnit = parseCompilationUnit(code);
       compilationUnit.accept(visitor);
     } finally {
       expect(logger.log, hasLength(0));
       AnalysisEngine.instance.logger = Logger.NULL;
     }
   }
 }