Fix icon on Windows XP taskbar

ui/views/win/hwnd_message_handler.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_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 #define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 
 #include <windows.h>
 
 #include <set>
@@ skipping 198 matching lines @@
   void SizeConstraintsChanged();
 
  private:
   typedef std::set<DWORD> TouchIDs;
 
   // Overridden from internal::InputMethodDelegate:
   virtual void DispatchKeyEventPostIME(const ui::KeyEvent& key) override;
 
   // Overridden from WindowImpl:
   virtual HICON GetDefaultWindowIcon() const override;
+  virtual HICON GetSmallWindowIcon() const override;
   virtual LRESULT OnWndProc(UINT message,
                             WPARAM w_param,
                             LPARAM l_param) override;
 
   // Overridden from WindowEventTarget
   virtual LRESULT HandleMouseMessage(unsigned int message,
                                      WPARAM w_param,
                                      LPARAM l_param,
                                      bool* handled) override;
   virtual LRESULT HandleKeyboardMessage(unsigned int message,
@@ skipping 398 matching lines @@
   // This member variable is set to true if the window is transitioning to
   // glass. Defaults to false.
   bool dwm_transition_desired_;
 
   DISALLOW_COPY_AND_ASSIGN(HWNDMessageHandler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_