Issue 19697. Partial fix - don't search for subclasss members.

pkg/analysis_server/lib/src/search/element_references.dart

Index: pkg/analysis_server/lib/src/search/element_references.dart
diff --git a/pkg/analysis_server/lib/src/search/element_references.dart b/pkg/analysis_server/lib/src/search/element_references.dart
index 77f46b677019083bc1b4fb4849764a7a3720de68..669fbdcd657993973799e1af3b63a3c015e6b877 100644
--- a/pkg/analysis_server/lib/src/search/element_references.dart
+++ b/pkg/analysis_server/lib/src/search/element_references.dart
@@ -83,7 +83,7 @@ class ElementReferencesComputer {
    */
   Future<Iterable<Element>> _getRefElements(Element element) {
     if (element is ClassMemberElement) {
-      return getHierarchyMembers(searchEngine, element);
+      return getHierarchyMembers(searchEngine, element, true);
     }
     return new Future.value([element]);
   }