MD Settings: add "Use system title bar and borders"

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 "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_factory.h"
 #include "chrome/browser/ui/browser_commands.h"
-#include "chrome/common/pref_names.h"
 #include "chrome/grit/generated_resources.h"
-#include "components/prefs/pref_service.h"
 #include "components/sessions/core/tab_restore_service.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
+#include "chrome/common/pref_names.h"
+#include "components/prefs/pref_service.h"
+#endif
+
 SystemMenuModelDelegate::SystemMenuModelDelegate(
     ui::AcceleratorProvider* provider,
     Browser* browser)
     : provider_(provider),
       browser_(browser) {
 }
 
 SystemMenuModelDelegate::~SystemMenuModelDelegate() {
 }
 
 bool SystemMenuModelDelegate::IsCommandIdChecked(int command_id) const {
-  switch (command_id) {
-    case IDC_USE_SYSTEM_TITLE_BAR: {
-      PrefService* prefs = browser_->profile()->GetPrefs();
-      return !prefs->GetBoolean(prefs::kUseCustomChromeFrame);
-    }
-    default:
-      return false;
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
+  if (command_id == IDC_USE_SYSTEM_TITLE_BAR) {
+    PrefService* prefs = browser_->profile()->GetPrefs();
+    return !prefs->GetBoolean(prefs::kUseCustomChromeFrame);
   }
+#endif
+  return false;
 }
 
 bool SystemMenuModelDelegate::IsCommandIdEnabled(int command_id) const {
   if (!chrome::IsCommandEnabled(browser_, command_id))
     return false;
 
   if (command_id != IDC_RESTORE_TAB)
     return true;
 
   // chrome::IsCommandEnabled(IDC_RESTORE_TAB) returns true if TabRestoreService
@@ skipping 31 matching lines @@
     if (trs && !trs->entries().empty() &&
         trs->entries().front()->type == sessions::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);
 }