Check default_container in FramePainter::UseSoloWindowHeader

ash/wm/frame_painter.cc

Index: ash/wm/frame_painter.cc
diff --git a/ash/wm/frame_painter.cc b/ash/wm/frame_painter.cc
index 94b9504a78cae8a54f87e28abcba2e7e471625fc..d544f32da9bab4cd85fb07fe746a0169802b096d 100644
--- a/ash/wm/frame_painter.cc
+++ b/ash/wm/frame_painter.cc
@@ -546,6 +546,8 @@ bool FramePainter::UseSoloWindowHeader(aura::Window* ignore) const {
     return false;
   const aura::Window* default_container = Shell::GetInstance()->GetContainer(
       internal::kShellWindowId_DefaultContainer);
+  if (!default_container)
+    return false;  // Shutting down.

[Daniel Erat, 2012/03/28 23:58:30]

please add a link to the bug

[stevenjb, 2012/03/29 00:44:18]

Done.

   int normal_window_count = 0;
   const aura::Window::Windows& windows = default_container->children();
   for (aura::Window::Windows::const_iterator it = windows.begin();