Remove the dependency on json schema compiler.

tools/json_schema_compiler/dart_test/empty_type.dart

Index: tools/json_schema_compiler/dart_test/empty_type.dart
diff --git a/tools/json_schema_compiler/dart_test/empty_type.dart b/tools/json_schema_compiler/dart_test/empty_type.dart
deleted file mode 100644
index 29e8df95c05b95f107901836cd8f7094303fdbb3..0000000000000000000000000000000000000000
--- a/tools/json_schema_compiler/dart_test/empty_type.dart
+++ /dev/null
@@ -1,37 +0,0 @@
-// 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.
-
-// Generated from namespace: empty_type
-
-part of chrome;
-
-/**
- * Types
- */
-
-class Empty_typeEmptyType extends ChromeObject {
-  /*
-   * Public constructor
-   */
-  Empty_typeEmptyType({}) {
-  }
-
-  /*
-   * Private constructor
-   */
-  Empty_typeEmptyType._proxy(_jsObject) : super._proxy(_jsObject);
-}
-
-/**
- * Functions
- */
-
-class API_empty_type {
-  /*
-   * API connection
-   */
-  Object _jsObject;
-  API_empty_type(this._jsObject) {
-  }
-}