Make SearchMatch usable for the new index - remove the element field.

pkg/analysis_server/lib/src/services/refactoring/rename_constructor.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.refactoring.rename_constructor;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol_server.dart' hide Element;
 import 'package:analysis_server/src/services/correction/source_range.dart';
@@ skipping 68 matching lines @@
     }
   }
 
   SourceReference _createDeclarationReference() {
     SourceRange sourceRange;
     if (element.periodOffset != null) {
       sourceRange = rangeStartEnd(element.periodOffset, element.nameEnd);
     } else {
       sourceRange = rangeStartLength(element.nameEnd, 0);
     }
-    String file = element.source.fullName;
-    return new SourceReference(file, sourceRange, element, true, true);
+    return new SourceReference(new SearchMatch(
+        element.context,
+        element.library.source.uri.toString(),
+        element.source.uri.toString(),
+        MatchKind.DECLARATION,
+        sourceRange,
+        true,
+        true));
   }
 }