Move the wire protocol support into the public API

pkg/analysis_server/test/integration/analysis/navigation_test.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 test.integration.analysis.navigation;
 
-import 'package:analysis_server/src/protocol.dart';
+import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../utils.dart';
 import '../integration_tests.dart';
 
 main() {
   initializeTestEnvironment();
   defineReflectiveTests(AnalysisNavigationTest);
 }
@@ skipping 107 matching lines @@
       checkLocal('method();', 'method() {', ElementKind.METHOD);
       checkLocal('parameter());', 'parameter) {', ElementKind.PARAMETER);
       checkLocal('field = 1', 'field;', ElementKind.SETTER);
       checkLocal('topLevelVariable;', 'topLevelVariable;',
           ElementKind.TOP_LEVEL_VARIABLE);
       checkLocal(
           'TypeParameter field;', 'TypeParameter>', ElementKind.TYPE_PARAMETER);
     });
   }
 }