Remove dart generator code from json schema compiler.

tools/json_schema_compiler/dart_test/functions.idl

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// A comment for the functions namespace.
-namespace functions {
-  callback SimpleCallback = void ();
-
-  callback PrimitiveCallback = void (int i);
-
-  callback DictCallback = void ([instanceOf=DictType] object dict);
-
-  dictionary DictType {
-    // A field.
-    int a;
-
-    // A parameter.
-    static void voidFunc();
-  };
-
-  interface Functions {
-    // Simple function.
-    static void voidFunc();
-
-    // Function taking a non-optional argument.
-    static void argFunc(DOMString s);
-
-    // Function taking an optional argument.
-    static void optionalArgFunc(optional DOMString s);
-
-    // Function taking a non-optional dictionary argument.
-    static void dictArgFunc(DictType d);
-
-    // Function taking an optional dictionary argument.
-    static void optionalDictArgFunc(optional DictType d);
-
-    // Function taking an entry argument.
-    static void entryArgFunc([intanceOf=FileEntry] object entry);
-
-    // Function taking a simple callback.
-    static void callbackFunc(SimpleCallback c);
-
-    // Function taking an optional simple callback.
-    static void optionalCallbackFunc(optional SimpleCallback c);
-
-    // Function taking a primitive callback.
-    static void primitiveCallbackFunc(PrimitiveCallback c);
-
-    // Function taking a dictionary callback.
-    static void dictCallbackFunc(DictCallback c);
-
-    // Function returning a dictionary.
-    static DictType dictRetFunc();
-  };
-};