Refactor preference syncing.

chrome/browser/net/net_pref_observer.cc

 // 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.
 
 #include "chrome/browser/net/net_pref_observer.h"
 
 #include "base/task.h"
 #include "chrome/browser/net/predictor_api.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/prerender/prerender_manager.h"
@@ skipping 53 matching lines @@
   if (!pref_name || *pref_name == prefs::kHttpThrottlingEnabled) {
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         NewRunnableFunction(SetEnforceThrottlingOnThrottlerManager,
                             *http_throttling_enabled_));
   }
 }
 
 // static
 void NetPrefObserver::RegisterPrefs(PrefService* prefs) {
-  prefs->RegisterBooleanPref(prefs::kNetworkPredictionEnabled, true);
-  prefs->RegisterBooleanPref(prefs::kDisableSpdy, false);
-  prefs->RegisterBooleanPref(prefs::kHttpThrottlingEnabled, false);
+  prefs->RegisterBooleanPref(prefs::kNetworkPredictionEnabled,
+                             true,
+                             PrefService::SYNCABLE_PREF);
+  prefs->RegisterBooleanPref(prefs::kDisableSpdy,
+                             false,
+                             PrefService::UNSYNCABLE_PREF);
+  prefs->RegisterBooleanPref(prefs::kHttpThrottlingEnabled,
+                             false,
+                             PrefService::UNSYNCABLE_PREF);
 }