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

chrome/browser/profiles/profile_impl.h

 // 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.
 
 // This class gathers state related to a single user profile.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 
 #include <memory>
@@ skipping 202 matching lines @@
   std::unique_ptr<policy::SchemaRegistryService> schema_registry_service_;
   std::unique_ptr<policy::CloudPolicyManager> cloud_policy_manager_;
   std::unique_ptr<policy::ProfilePolicyConnector> profile_policy_connector_;
 
   // Keep |pref_validation_delegate_| above |prefs_| so that the former outlives
   // the latter.
   std::unique_ptr<TrackedPreferenceValidationDelegate>
       pref_validation_delegate_;
 
   // Keep |prefs_| on top for destruction order because |extension_prefs_|,
-  // |net_pref_observer_|, |io_data_| and others store pointers to |prefs_| and
-  // shall be destructed first.
+  // |io_data_| and others store pointers to |prefs_| and shall be destructed
+  // first.
   scoped_refptr<user_prefs::PrefRegistrySyncable> pref_registry_;
   std::unique_ptr<syncable_prefs::PrefServiceSyncable> prefs_;
   std::unique_ptr<syncable_prefs::PrefServiceSyncable> otr_prefs_;
   ProfileImplIOData::Handle io_data_;
 #if defined(ENABLE_EXTENSIONS)
   scoped_refptr<ExtensionSpecialStoragePolicy>
       extension_special_storage_policy_;
 #endif
-  std::unique_ptr<NetPrefObserver> net_pref_observer_;
   std::unique_ptr<ssl_config::SSLConfigServiceManager>
       ssl_config_service_manager_;
 
   // Exit type the last time the profile was opened. This is set only once from
   // prefs.
   ExitType last_session_exit_type_;
 
 #if defined(ENABLE_SESSION_SERVICE)
   base::OneShotTimer create_session_service_timer_;
 #endif
@@ skipping 26 matching lines @@
   // components/keyed_service/content/browser_context_keyed_service_factory.*
 
   Profile::Delegate* delegate_;
 
   chrome_browser_net::Predictor* predictor_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileImpl);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_