Fix icon on Windows XP taskbar

ui/gfx/win/window_impl.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 UI_GFX_WIN_WINDOW_IMPL_H_
 #define UI_GFX_WIN_WINDOW_IMPL_H_
 
 #include <string>
 
 #include "base/logging.h"
@@ skipping 33 matching lines @@
   // Causes all generated windows classes to be unregistered at exit.
   // This can cause result in errors for tests that don't destroy all instances
   // of windows, but is necessary if the tests unload the classes WndProc.
   static void UnregisterClassesAtExit();
 
   // Initializes the Window with a parent and an initial desired size.
   void Init(HWND parent, const gfx::Rect& bounds);
 
   // Returns the default window icon to use for windows of this type.
   virtual HICON GetDefaultWindowIcon() const;
+  virtual HICON GetSmallWindowIcon() const;
 
   // Returns the HWND associated with this Window.
   HWND hwnd() const { return hwnd_; }
 
   // Sets the window styles. This is ONLY used when the window is created.
   // In other words, if you invoke this after invoking Init, nothing happens.
   void set_window_style(DWORD style) { window_style_ = style; }
   DWORD window_style() const { return window_style_; }
 
   // Sets the extended window styles. See comment about |set_window_style|.
@@ skipping 51 matching lines @@
   bool got_create_;
   bool got_valid_hwnd_;
   bool* destroyed_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowImpl);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_WIN_WINDOW_IMPL_H_