Refactor preference syncing.

chrome/browser/background_contents_service.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/background_contents_service.h"
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
@@ skipping 535 matching lines @@
   for (BackgroundContentsMap::const_iterator it = contents_map_.begin();
        it != contents_map_.end(); ++it) {
     if (contents == it->second.contents)
       return it->first;
   }
   return EmptyString16();
 }
 
 // static
 void BackgroundContentsService::RegisterUserPrefs(PrefService* prefs) {
-  prefs->RegisterDictionaryPref(prefs::kRegisteredBackgroundContents);
+  prefs->RegisterDictionaryPref(prefs::kRegisteredBackgroundContents,
+                                false /* don't sync pref */);
 }
 
 void BackgroundContentsService::AddTabContents(
     TabContents* new_contents,
     WindowOpenDisposition disposition,
     const gfx::Rect& initial_pos,
     bool user_gesture) {
   Browser* browser = BrowserList::GetLastActiveWithProfile(
       new_contents->profile());
   if (!browser)
     return;
   browser->AddTabContents(new_contents, disposition, initial_pos, user_gesture);
 }