Move about:net-internals webui files into a subdirectory + OWNERS

chrome/browser/ui/webui/net_internals_ui.h

-// Copyright (c) 2011 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 CHROME_BROWSER_UI_WEBUI_NET_INTERNALS_UI_H_
-#define CHROME_BROWSER_UI_WEBUI_NET_INTERNALS_UI_H_
-#pragma once
-
-#include "content/browser/webui/web_ui.h"
-
-namespace base {
-class Value;
-}
-
-class NetInternalsUI : public WebUI {
- public:
-  explicit NetInternalsUI(content::WebContents* contents);
-
-  // Returns a Value containing constants NetInternals needs to load a log file.
-  // Safe to call on any thread.  Caller takes ownership of the returned Value.
-  static base::Value* GetConstants();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(NetInternalsUI);
-};
-
-#endif  // CHROME_BROWSER_UI_WEBUI_NET_INTERNALS_UI_H_