Fix for renaming (an invalid) ClassElement invocation.

pkg/analysis_server/lib/src/services/index/index_contributor.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 services.src.index.index_contributor;
 
 import 'dart:collection' show Queue;
 
 import 'package:analysis_server/plugin/index/index_core.dart';
 import 'package:analysis_server/src/services/correction/namespace.dart';
@@ skipping 343 matching lines @@
     recordRelationshipIndexable(
         new IndexableName(name.name), IndexConstants.IS_INVOKED_BY, location);
     // element invocation
     Element element = name.bestElement;
     if (element is MethodElement ||
         element is PropertyAccessorElement ||
         element is FunctionElement ||
         element is VariableElement) {
       recordRelationshipElement(
           element, IndexConstants.IS_INVOKED_BY, location);
+    } else if (element is ClassElement) {
+      recordRelationshipElement(
+          element, IndexConstants.IS_REFERENCED_BY, location);
     }
     _recordImportElementReferenceWithoutPrefix(name);
     super.visitMethodInvocation(node);
   }
 
   @override
   visitPartDirective(PartDirective node) {
     Element element = node.element;
     LocationImpl location = _createLocationForNode(node.uri);
     recordRelationshipElement(
@@ skipping 436 matching lines @@
   }
 
   /**
    * @return `true` if given "node" is part of [PrefixedIdentifier] "prefix.node".
    */
   static bool _isIdentifierInPrefixedIdentifier(SimpleIdentifier node) {
     AstNode parent = node.parent;
     return parent is PrefixedIdentifier && parent.identifier == node;
   }
 }