[Mojo] Remove static "bootstrap" state in mojo_js

mojo/apps/js/bootstrap.h

-// 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.
-
-#ifndef MOJO_APPS_JS_BOOTSTRAP_H_
-#define MOJO_APPS_JS_BOOTSTRAP_H_
-
-#include "mojo/public/system/core.h"
-#include "v8/include/v8.h"
-
-namespace mojo {
-namespace apps {
-
-class Bootstrap {
- public:
-  static const char kModuleName[];
-  static v8::Local<v8::ObjectTemplate> GetTemplate(v8::Isolate* isolate);
-
-  // Must be called before the first call to GetTemplate.
-  static void SetInitialHandle(MojoHandle handle);
-};
-
-}  // namespace apps
-}  // namespace mojo
-
-#endif  // MOJO_APPS_JS_BOOTSTRAP_H_