Refactor preference syncing.

chrome/browser/profiles/profile_impl.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/profiles/profile_impl.h"
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/environment.h"
 #include "base/file_path.h"
@@ skipping 237 matching lines @@
   BrowserThread::PostTask(BrowserThread::FILE,
                           FROM_HERE,
                           NewRunnableFunction(&file_util::CreateDirectory,
                                               path));
   // Async version.
   return new ProfileImpl(path, delegate);
 }
 
 // static
 void ProfileImpl::RegisterUserPrefs(PrefService* prefs) {
-  prefs->RegisterBooleanPref(prefs::kSavingBrowserHistoryDisabled, false);
-  prefs->RegisterBooleanPref(prefs::kClearSiteDataOnExit, false);
+  prefs->RegisterBooleanPref(prefs::kSavingBrowserHistoryDisabled,
+                             false,
+                             false /* don't sync pref */);
+  prefs->RegisterBooleanPref(prefs::kClearSiteDataOnExit,
+                             false,
+                             true /* sync pref */);
 }
 
 ProfileImpl::ProfileImpl(const FilePath& path,
                          Profile::Delegate* delegate)
     : path_(path),
       visited_link_event_listener_(new VisitedLinkEventListener()),
       extension_devtools_manager_(NULL),
       ALLOW_THIS_IN_INITIALIZER_LIST(io_data_(this)),
       host_content_settings_map_(NULL),
       host_zoom_map_(NULL),
@@ skipping 1289 matching lines @@
   return pref_proxy_config_tracker_;
 }
 
 prerender::PrerenderManager* ProfileImpl::GetPrerenderManager() {
   if (!prerender::PrerenderManager::IsPrerenderingPossible())
     return NULL;
   if (!prerender_manager_.get())
     prerender_manager_.reset(new prerender::PrerenderManager(this));
   return prerender_manager_.get();
 }