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

chrome/browser/ui/views/frame/system_menu_model_delegate.cc

Index: chrome/browser/ui/views/frame/system_menu_model_delegate.cc
diff --git a/chrome/browser/ui/views/frame/system_menu_model_delegate.cc b/chrome/browser/ui/views/frame/system_menu_model_delegate.cc
index 0bfc61ad767c5141f86c07be005e8d7a0ef369ac..81bad9dd98657a829ccb91bfa374a128405d891e 100644
--- a/chrome/browser/ui/views/frame/system_menu_model_delegate.cc
+++ b/chrome/browser/ui/views/frame/system_menu_model_delegate.cc
@@ -4,11 +4,14 @@
 
 #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"
 
@@ -23,9 +26,14 @@ 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 {