Remove unused option in server API

pkg/analysis_server/test/integration/integration_test_methods.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.
 //
 // This file has been automatically generated.  Please do not edit it manually.
 // To regenerate the file, use the script
 // "pkg/analysis_server/tool/spec/generate_files".
 
 /**
  * Convenience methods for running integration tests
@@ skipping 401 matching lines @@
    *
    *   A list of the files and directories that should be analyzed.
    *
    * excluded (List<FilePath>)
    *
    *   A list of the files and directories within the included directories that
    *   should not be analyzed.
    *
    * packageRoots (optional Map<FilePath, FilePath>)
    *
+   *   Deprecated: This field is now ignored by server.
+   *
    *   A mapping from source directories to package roots that should override
    *   the normal package: URI resolution mechanism.
    *
    *   If a package root is a directory, then the analyzer will behave as
    *   though the associated source directory in the map contains a special
    *   pubspec.yaml file which resolves any package: URI to the corresponding
    *   path within that package root directory. The effect is the same as
    *   specifying the package root directory as a "--package_root" parameter to
    *   the Dart VM when executing any Dart file inside the source directory.
    *
@@ skipping 1312 matching lines @@
       case "execution.launchData":
         expect(params, isExecutionLaunchDataParams);
         _onExecutionLaunchData.add(new ExecutionLaunchDataParams.fromJson(decoder, 'params', params));
         break;
       default:
         fail('Unexpected notification: $event');
         break;
     }
   }
 }