Fixed brekage when PureViews are enable but Desktop is not

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

Index: chrome/browser/ui/views/frame/browser_frame_gtk.cc
diff --git a/chrome/browser/ui/views/frame/browser_frame_gtk.cc b/chrome/browser/ui/views/frame/browser_frame_gtk.cc
index dd19ae82e01e9ce351da85e7d679a62b1b5343c0..2c9223a0e6f207a50a3b81b74f3945d731ff1709 100644
--- a/chrome/browser/ui/views/frame/browser_frame_gtk.cc
+++ b/chrome/browser/ui/views/frame/browser_frame_gtk.cc
@@ -14,6 +14,7 @@
 #include "chrome/browser/ui/views/frame/browser_non_client_frame_view.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
 #include "ui/gfx/font.h"
+#include "views/views_delegate.h"
 #include "views/widget/root_view.h"
 #include "views/widget/widget.h"
 #include "views/window/hit_test.h"
@@ -91,7 +92,8 @@ gboolean BrowserFrameGtk::OnConfigureEvent(GtkWidget* widget,
 NativeBrowserFrame* NativeBrowserFrame::CreateNativeBrowserFrame(
     BrowserFrame* browser_frame,
     BrowserView* browser_view) {
-  if (views::Widget::IsPureViews())
+  if (views::Widget::IsPureViews() &&
+      views::ViewsDelegate::views_delegate->GetDefaultParentView())
     return new BrowserFrameViews(browser_frame, browser_view);
   return new BrowserFrameGtk(browser_frame, browser_view);
 }