Remove unused methods in analysis_server.

pkg/analysis_server/test/analysis_abstract.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.domain.analysis.abstract;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/domain_analysis.dart';
@@ skipping 239 matching lines @@
     serverChannel = null;
   }
 
   /**
    * Returns a [Future] that completes when the [AnalysisServer] finishes
    * all its scheduled tasks.
    */
   Future waitForTasksFinished() {
     return waitForServerOperationsPerformed(server);
   }
-
-  static String _getCodeString(code) {
-    if (code is List<String>) {
-      code = code.join('\n');
-    }
-    return code as String;
-  }
 }