Linux Aura: Use system title bar is now set by preference, not flag.

chrome/browser/ui/views/frame/system_menu_model_delegate.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/ui/views/frame/system_menu_model_delegate.h"
 
+#include "base/prefs/pref_service.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/command_updater.h"
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/tab_restore_service.h"
 #include "chrome/browser/sessions/tab_restore_service_factory.h"
 #include "chrome/browser/ui/browser_commands.h"
+#include "chrome/common/pref_names.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
 SystemMenuModelDelegate::SystemMenuModelDelegate(
     ui::AcceleratorProvider* provider,
     Browser* browser)
     : provider_(provider),
       browser_(browser) {
 }
 
 SystemMenuModelDelegate::~SystemMenuModelDelegate() {
 }
 
 bool SystemMenuModelDelegate::IsCommandIdChecked(int command_id) const {
-  // TODO(beng): encoding menu.
-  // No items in our system menu are check-able.
-  return false;
+  switch (command_id) {
+    case IDC_USE_SYSTEM_TITLE_BAR: {
+      PrefService* prefs = browser_->profile()->GetPrefs();
+      return !prefs->GetBoolean(prefs::kUseCustomChromeFrame);
+    }
+    default:
+      return false;
+  }
 }
 
 bool SystemMenuModelDelegate::IsCommandIdEnabled(int command_id) const {
   return chrome::IsCommandEnabled(browser_, command_id);
 }
 
 bool SystemMenuModelDelegate::GetAcceleratorForCommandId(int command_id,
                                              ui::Accelerator* accelerator) {
   return provider_->GetAcceleratorForCommandId(command_id, accelerator);
 }
@@ skipping 12 matching lines @@
         TabRestoreServiceFactory::GetForProfile(browser_->profile());
     if (trs && trs->entries().front()->type == TabRestoreService::WINDOW)
       string_id = IDS_RESTORE_WINDOW;
   }
   return l10n_util::GetStringUTF16(string_id);
 }
 
 void SystemMenuModelDelegate::ExecuteCommand(int command_id, int event_flags) {
   chrome::ExecuteCommand(browser_, command_id);
 }