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

chrome/browser/ui/panels/panel_browser_window_gtk.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_WINDOW_GTK_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_WINDOW_GTK_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
 #include "chrome/browser/ui/gtk/browser_window_gtk.h"
@@ skipping 93 matching lines @@
       const NativeWebKeyboardEvent& event) OVERRIDE;
   virtual void FullScreenModeChanged(bool is_full_screen) OVERRIDE;
   virtual Browser* GetPanelBrowser() const OVERRIDE;
   virtual void DestroyPanelBrowser() OVERRIDE;
   virtual gfx::Size WindowSizeFromContentSize(
       const gfx::Size& content_size) const OVERRIDE;
   virtual gfx::Size ContentSizeFromWindowSize(
       const gfx::Size& window_size) const OVERRIDE;
   virtual int TitleOnlyHeight() const 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 UpdatePanelMinimizeRestoreButtonVisibility() OVERRIDE;
 
  private:
   friend class NativePanelTestingGtk;
 
   void StartBoundsAnimation(const gfx::Rect& from_bounds,
                             const gfx::Rect& to_bounds);
   bool IsAnimatingBounds() const;
 
   // Overridden from AnimationDelegate:
   virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE;
@@ skipping 32 matching lines @@
   // current one completes. In this case, we want to start the new animation
   // from where the last one left.
   gfx::Rect last_animation_progressed_bounds_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelBrowserWindowGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_WINDOW_GTK_H_