Update Panel mininimize/restore button on strip and expansion state change.

chrome/browser/ui/panels/panel_browser_view.h

Index: chrome/browser/ui/panels/panel_browser_view.h
diff --git a/chrome/browser/ui/panels/panel_browser_view.h b/chrome/browser/ui/panels/panel_browser_view.h
index 7cdf79ca434a69739410c7e8816b8fc70539d894..ae6539f44482f4bf73958375bfc9cfd44e98b4c8 100644
--- a/chrome/browser/ui/panels/panel_browser_view.h
+++ b/chrome/browser/ui/panels/panel_browser_view.h
@@ -122,9 +122,9 @@ class PanelBrowserView : public BrowserView,
   virtual Browser* GetPanelBrowser() const OVERRIDE;
   virtual void DestroyPanelBrowser() OVERRIDE;
   virtual void EnsurePanelFullyVisible() OVERRIDE;
-  virtual void SetPanelAppIconVisibility(bool visible) OVERRIDE;
   virtual void SetPanelAlwaysOnTop(bool on_top) OVERRIDE;
   virtual void EnableResizeByMouse(bool enable) OVERRIDE;
+  virtual void UpdateMinimizeRestoreButtonVisibility() OVERRIDE;
 
   // Overridden from AnimationDelegate:
   virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE;