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

chrome/browser/ui/browser_command_controller.cc

Index: chrome/browser/ui/browser_command_controller.cc
diff --git a/chrome/browser/ui/browser_command_controller.cc b/chrome/browser/ui/browser_command_controller.cc
index 619b5cd769b1797834639396fce497bf9128be1a..0015ff72c76d61b5136463262300acc4505b1c95 100644
--- a/chrome/browser/ui/browser_command_controller.cc
+++ b/chrome/browser/ui/browser_command_controller.cc
@@ -474,6 +474,15 @@ void BrowserCommandController::ExecuteCommandWithDisposition(
       break;
 #endif
 
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS) && !defined(TOOLKIT_GTK)
+    case IDC_USE_SYSTEM_TITLE_BAR: {
+      PrefService* prefs = browser_->profile()->GetPrefs();
+      prefs->SetBoolean(prefs::kUseCustomChromeFrame,
+                        !prefs->GetBoolean(prefs::kUseCustomChromeFrame));
+      break;
+    }
+#endif
+
 #if defined(OS_WIN)
     // Windows 8 specific commands.
     case IDC_METRO_SNAP_ENABLE:
@@ -895,6 +904,9 @@ void BrowserCommandController::InitCommandState() {
   command_updater_.UpdateCommandEnabled(IDC_VISIT_DESKTOP_OF_LRU_USER_2, true);
   command_updater_.UpdateCommandEnabled(IDC_VISIT_DESKTOP_OF_LRU_USER_3, true);
 #endif
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS) && !defined(TOOLKIT_GTK)
+  command_updater_.UpdateCommandEnabled(IDC_USE_SYSTEM_TITLE_BAR, true);
+#endif
 
   // Page-related commands
   command_updater_.UpdateCommandEnabled(IDC_EMAIL_PAGE_LOCATION, true);