Remove references to Engine classes from protocol.dart

pkg/analysis_server/lib/src/computer/computer_navigation.dart

Index: pkg/analysis_server/lib/src/computer/computer_navigation.dart
diff --git a/pkg/analysis_server/lib/src/computer/computer_navigation.dart b/pkg/analysis_server/lib/src/computer/computer_navigation.dart
index a82cbe1e20c64fb4e0d509eeda59c372698d79c0..17f9af55b46ffb33dd1ce2556ea7578f2b575fe3 100644
--- a/pkg/analysis_server/lib/src/computer/computer_navigation.dart
+++ b/pkg/analysis_server/lib/src/computer/computer_navigation.dart
@@ -4,7 +4,7 @@
 
 library computer.navigation;
 
-import 'package:analysis_server/src/protocol.dart' as protocol;
+import 'package:analysis_server/src/protocol_server.dart' as protocol;
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/scanner.dart';
@@ -36,7 +36,7 @@ class DartUnitNavigationComputer {
     if (element == null || element == DynamicElementImpl.instance) {
       return;
     }
-    protocol.Element target = new protocol.Element.fromEngine(element);
+    protocol.Element target = protocol.newElement_fromEngine(element);
     _regions.add(new protocol.NavigationRegion(offset, length, [target]));
   }