Fix bug 105043: Panels [WIN]: For minimize panels, taskbar hover preview show the 4-pixel represent…

chrome/browser/ui/panels/panel_browser_window_cocoa.mm

 // 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.
 
 #include "chrome/browser/ui/panels/panel_browser_window_cocoa.h"
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
@@ skipping 335 matching lines @@
 }
 
 void PanelBrowserWindowCocoa::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   DCHECK_EQ(chrome::NOTIFICATION_PANEL_CHANGED_EXPANSION_STATE, type);
   [controller_ updateWindowLevel];
 }
 
+void PanelBrowserWindowCocoa::PanelExpansionStateChanging(
+    Panel::ExpansionState old_state, Panel::ExpansionState new_state) {
+}
+
 // NativePanelTesting implementation.
 class NativePanelTestingCocoa : public NativePanelTesting {
  public:
   NativePanelTestingCocoa(NativePanel* native_panel);
   virtual ~NativePanelTestingCocoa() { }
   // Overridden from NativePanelTesting
   virtual void PressLeftMouseButtonTitlebar(
       const gfx::Point& mouse_location, panel::ClickModifier modifier) OVERRIDE;
   virtual void ReleaseMouseButtonTitlebar(
       panel::ClickModifier modifier) OVERRIDE;
@@ skipping 84 matching lines @@
       return ![[titlebar() closeButton] isHidden];
     case MINIMIZE_BUTTON:
       return ![[titlebar() minimizeButton] isHidden];
     case RESTORE_BUTTON:
       return ![[titlebar() restoreButton] isHidden];
     default:
       NOTREACHED();
   }
   return false;
 }