Update server generator

pkg/analysis_server/tool/spec/codegen_dart_protocol.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 codegen.protocol;
 
 import 'dart:convert';
 
 import 'package:analyzer/src/codegen/tools.dart';
 import 'package:html/dom.dart' as dom;
@@ skipping 198 matching lines @@
    */
   void emitEmptyObjectClass(String className, ImpliedType impliedType) {
     docComment(toHtmlVisitor.collectHtml(() {
       toHtmlVisitor.p(() {
         toHtmlVisitor.write(impliedType.humanReadableName);
       });
       toHtmlVisitor.p(() {
         toHtmlVisitor.write(disclaimer);
       });
     }));
-    writeln('class $className {');
+    write('class $className');
+    if (impliedType.kind == 'refactoringFeedback') {
+      writeln(' extends RefactoringFeedback {');
+    } else if (impliedType.kind == 'refactoringOptions') {
+      writeln(' extends RefactoringOptions {');
+    } else {
+      writeln(' {');
+    }
     indent(() {
       if (emitToRequestMember(impliedType)) {
         writeln();
       }
       if (emitToResponseMember(impliedType)) {
         writeln();
       }
       if (emitToNotificationMember(impliedType)) {
         writeln();
       }
@@ skipping 141 matching lines @@
       });
       if (impliedType.type != null) {
         toHtmlVisitor.showType(null, impliedType.type);
       }
       toHtmlVisitor.p(() {
         toHtmlVisitor.write(disclaimer);
       });
     }));
     write('class $className');
     if (impliedType.kind == 'refactoringFeedback') {
-      write(' extends RefactoringFeedback');
+      writeln(' extends RefactoringFeedback {');
+    } else if (impliedType.kind == 'refactoringOptions') {
+      writeln(' extends RefactoringOptions {');
+    } else {
+      writeln(' implements HasToJson {');
     }
-    if (impliedType.kind == 'refactoringOptions') {
-      write(' extends RefactoringOptions');
-    }
-    writeln(' implements HasToJson {');
     indent(() {
       if (emitSpecialStaticMembers(className)) {
         writeln();
       }
       for (TypeObjectField field in type.fields) {
         if (field.value != null) {
           continue;
         }
         writeln('${dartType(field.type)} _${field.name};');
         writeln();
@@ skipping 836 matching lines @@
 
   @override
   String get asClosure => '($type value) => ${callback('value')}';
 
   @override
   bool get isIdentity => false;
 
   @override
   String asSnippet(String value) => callback(value);
 }