Clean up imports in analysis_server and analyzer_cli (and one missed in analyzer)

pkg/analysis_server/lib/src/search/element_references.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 search.element_references;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/collections.dart';
 import 'package:analysis_server/src/protocol_server.dart'
     show SearchResult, newSearchResult_fromMatch;
 import 'package:analysis_server/src/services/search/hierarchy.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
-import 'package:analyzer/src/generated/element.dart';
+import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/generated/source.dart';
 
 /**
  * A computer for `search.findElementReferences` request results.
  */
 class ElementReferencesComputer {
   final SearchEngine searchEngine;
 
   ElementReferencesComputer(this.searchEngine);
 
@@ skipping 117 matching lines @@
    * Adds a [Future] or an [E] value to results.
    */
   void add(value) {
     if (value is Future) {
       _futures.add(value);
     } else {
       _futures.add(new Future.value(<E>[value]));
     }
   }
 }