Finish modifying analysis server to make use of code generation.

pkg/analysis_server/lib/src/computer/computer_occurrences.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 computer.occurrences;
 
 import 'dart:collection';
 
-import 'package:analysis_server/src/protocol2.dart' as protocol;
+import 'package:analysis_server/src/protocol.dart' as protocol;
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 
 
 /**
  * A computer for elements occurrences in a Dart [CompilationUnit].
  */
 class DartUnitOccurrencesComputer {
   final CompilationUnit _unit;
 
@@ skipping 51 matching lines @@
 
   @override
   visitSimpleIdentifier(SimpleIdentifier node) {
     Element element = node.bestElement;
     if (element != null) {
       computer._addOccurrence(element, node.offset);
     }
     return super.visitSimpleIdentifier(node);
   }
 }