Remove dart generator code from json schema compiler.

tools/json_schema_compiler/dart_test/comments.dart

-// Copyright (c) 2015, 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.
-
-// Generated from namespace: comments
-
-part of chrome;
-/**
- * Functions
- */
-
-class API_comments {
-  /*
-   * API connection
-   */
-  Object _jsObject;
-
-  /*
-   * Functions
-   */
-  /// <p>There's a blank line at the start of this comment.</p><p>Documentation
-  /// for basicFunction. BasicFunction() is a great function. There is a newline
-  /// after this.</p><p>It works like so:        +-----+        |     |     +--+
-  ///       |     |     |  |        +-----+ --> +--+</p><p>Some other stuff here.
-  ///    This paragraph starts with whitespace.    Overall, its a great function.
-  /// There's also a blank line at the end of this comment.</p>
-  void basicFunction() => JS('void', '#.basicFunction()', this._jsObject);
-
-  API_comments(this._jsObject) {
-  }
-}