Remove new dialog style command-line flags, etc.

ash/wm/system_modal_container_layout_manager.cc

Index: ash/wm/system_modal_container_layout_manager.cc
diff --git a/ash/wm/system_modal_container_layout_manager.cc b/ash/wm/system_modal_container_layout_manager.cc
index 9b23e62f3d99b1b74ed14cce1d81e31627d4c7bd..453002689e6047ea1f8deb09fdbd8c5ff8fe6985 100644
--- a/ash/wm/system_modal_container_layout_manager.cc
+++ b/ash/wm/system_modal_container_layout_manager.cc
@@ -155,8 +155,7 @@ void SystemModalContainerLayoutManager::CreateModalBackground() {
     modal_background_->GetNativeView()->SetName(
         "SystemModalContainerLayoutManager.ModalBackground");
     views::View* contents_view = new views::View();
-    // TODO(jamescook): This could also be SK_ColorWHITE if using the new
-    // dialog style via switches::IsNewDialogStyleEnabled().
+    // TODO(jamescook): This could be SK_ColorWHITE for the new dialog style.
     contents_view->set_background(
         views::Background::CreateSolidBackground(SK_ColorBLACK));
     modal_background_->SetContentsView(contents_view);