Remove native_stack accessor from StackedPanelCollection

chrome/browser/ui/panels/stacked_panel_collection.h

Index: chrome/browser/ui/panels/stacked_panel_collection.h
diff --git a/chrome/browser/ui/panels/stacked_panel_collection.h b/chrome/browser/ui/panels/stacked_panel_collection.h
index 404077c02ab480d0297d912404a360822c422773..01f08bf1dbf122a2a6f567a17f6b650265848b30 100644
--- a/chrome/browser/ui/panels/stacked_panel_collection.h
+++ b/chrome/browser/ui/panels/stacked_panel_collection.h
@@ -65,13 +65,14 @@ class StackedPanelCollection : public PanelCollection {
 
   void MoveAllDraggingPanelsInstantly(const gfx::Vector2d& delta_origin);
 
+  bool IsMinimized() const;
+
   // Returns the maximum available space from the bottom of the stack. The
   // maximum available space is defined as the distance between the bottom
   // of the stack and the bottom of the working area, assuming that all inactive
   // panels are collapsed.
   int GetMaximiumAvailableBottomSpace() const;
 
-  NativePanelStackWindow* native_stack() const { return native_stack_; }
   int num_panels() const { return panels_.size(); }
   const Panels& panels() const { return panels_; }
   Panel* top_panel() const { return panels_.empty() ? NULL : panels_.front(); }