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

chrome/browser/net/net_pref_observer.cc

-// 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.
-
-#include "chrome/browser/net/net_pref_observer.h"
-
-#include "base/bind.h"
-#include "base/logging.h"
-#include "chrome/common/pref_names.h"
-#include "components/pref_registry/pref_registry_syncable.h"
-#include "components/prefs/pref_service.h"
-#include "content/public/browser/browser_thread.h"
-#include "net/http/http_stream_factory.h"
-
-using content::BrowserThread;
-
-NetPrefObserver::NetPrefObserver(PrefService* prefs) {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  DCHECK(prefs);
-}
-
-NetPrefObserver::~NetPrefObserver() {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-}
-
-// static
-void NetPrefObserver::RegisterProfilePrefs(
-    user_prefs::PrefRegistrySyncable* registry) {
-  registry->RegisterBooleanPref(
-      prefs::kNetworkPredictionEnabled,
-      true,
-      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
-  registry->RegisterBooleanPref(prefs::kDisableSpdy, false);
-}