Change panel overflow to not close any open panels.

chrome/browser/ui/panels/panel_manager.h

Index: chrome/browser/ui/panels/panel_manager.h
diff --git a/chrome/browser/ui/panels/panel_manager.h b/chrome/browser/ui/panels/panel_manager.h
index 243f60cdc6903fd6b35b30ffd8b50f707e1a73b2..b419c8f91116cf1955e58a794e86f0fa770af259 100644
--- a/chrome/browser/ui/panels/panel_manager.h
+++ b/chrome/browser/ui/panels/panel_manager.h
@@ -148,10 +148,6 @@ class PanelManager : public PanelMouseWatcher::Observer,
   // area being changed or a panel being closed.
   void Rearrange(Panels::iterator iter_to_start, int rightmost_position);
 
-  // Finds one panel to close so that we may have space for the new panel
-  // created by |extension|.
-  void FindAndClosePanelOnOverflow(const Extension* extension);
-
   // Help functions to drag the given panel.
   void DragLeft();
   void DragRight();
@@ -168,10 +164,6 @@ class PanelManager : public PanelMouseWatcher::Observer,
   int GetMaxPanelHeight() const;
   int GetRightMostAvailablePosition() const;
 
-  // Updates the maximum size of each panel as the result of adding, removing,
-  // or sizing panels.
-  void UpdateMaxSizeForAllPanels();
-
   Panels panels_;
 
   // Stores the panels that are pending to remove. We want to delay the removal