Extract protocol_dart.dart APIs.

pkg/analysis_server/lib/src/domains/analysis/occurrences_dart.dart

 // Copyright (c) 2015, 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 domains.analysis.occurrences_dart;
 
 import 'package:analysis_server/plugin/analysis/occurrences/occurrences_core.dart';
 import 'package:analysis_server/src/protocol_server.dart' as protocol;
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
@@ skipping 11 matching lines @@
     if (libraries.isNotEmpty) {
       CompilationUnit unit =
           context.getResolvedCompilationUnit2(source, libraries.first);
       if (unit != null) {
         _DartUnitOccurrencesComputerVisitor visitor =
             new _DartUnitOccurrencesComputerVisitor();
         unit.accept(visitor);
         visitor.elementsOffsets.forEach((engineElement, offsets) {
           int length = engineElement.nameLength;
           protocol.Element serverElement =
-              protocol.newElement_fromEngine(engineElement);
+              protocol.convertElement(engineElement);
           protocol.Occurrences occurrences =
               new protocol.Occurrences(serverElement, offsets, length);
           collector.addOccurrences(occurrences);
         });
       }
     }
   }
 }
 
 class _DartUnitOccurrencesComputerVisitor extends RecursiveAstVisitor {
@@ skipping 27 matching lines @@
     }
     if (element is PropertyAccessorElement) {
       element = (element as PropertyAccessorElement).variable;
     }
     if (element is Member) {
       element = (element as Member).baseElement;
     }
     return element;
   }
 }