Remove mojo/apps/js, it is unused

mojo/apps/js/bindings/threading.h

Index: mojo/apps/js/bindings/threading.h
diff --git a/mojo/apps/js/bindings/threading.h b/mojo/apps/js/bindings/threading.h
deleted file mode 100644
index ac8e221377afdeadb90036334beac1a1f2727353..0000000000000000000000000000000000000000
--- a/mojo/apps/js/bindings/threading.h
+++ /dev/null
@@ -1,25 +0,0 @@
-// 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_BINDINGS_THREADING_H_
-#define MOJO_APPS_JS_BINDINGS_THREADING_H_
-
-#include "gin/public/wrapper_info.h"
-#include "v8/include/v8.h"
-
-namespace mojo {
-namespace apps {
-
-class Threading {
- public:
-  static const char kModuleName[];
-  static v8::Local<v8::Value> GetModule(v8::Isolate* isolate);
- private:
-  Threading();
-};
-
-}  // namespace apps
-}  // namespace mojo
-
-#endif  // MOJO_APPS_JS_BINDINGS_THREADING_H_