Remove NetPrefObserver class and two prefs that do not do anything.

chrome/browser/net/net_pref_observer.h

Index: chrome/browser/net/net_pref_observer.h
diff --git a/chrome/browser/net/net_pref_observer.h b/chrome/browser/net/net_pref_observer.h
deleted file mode 100644
index 74bdd4f01d7abcc4c4744c6bdd3df98b96303ba7..0000000000000000000000000000000000000000
--- a/chrome/browser/net/net_pref_observer.h
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright (c) 2012 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_NET_NET_PREF_OBSERVER_H_
-#define CHROME_BROWSER_NET_NET_PREF_OBSERVER_H_
-
-#include "base/macros.h"
-#include "components/prefs/pref_member.h"
-
-class PrefService;
-
-namespace user_prefs {
-class PrefRegistrySyncable;
-}
-
-// Monitors network-related preferences for changes and applies them.
-// The supplied PrefService must outlive this NetPrefObserver.
-// Must be used only on the UI thread.
-class NetPrefObserver {
- public:
-  // |prefs| must be non-NULL and |*prefs| must outlive this.
-  explicit NetPrefObserver(PrefService* prefs);
-  virtual ~NetPrefObserver();
-
-  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(NetPrefObserver);
-};
-
-#endif  // CHROME_BROWSER_NET_NET_PREF_OBSERVER_H_