Fix icon on Windows XP taskbar

ui/views/test/test_views_delegate.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_TEST_TEST_VIEWS_DELEGATE_H_
 #define UI_VIEWS_TEST_TEST_VIEWS_DELEGATE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/views/views_delegate.h"
 
@@ skipping 18 matching lines @@
   void set_use_transparent_windows(bool transparent) {
     use_transparent_windows_ = transparent;
   }
 
   // Allows tests to provide a ContextFactory via the ViewsDelegate interface.
   void set_context_factory(ui::ContextFactory* context_factory) {
     context_factory_ = context_factory;
   }
 
   // ViewsDelegate:
+#if defined(OS_WIN)
+  HICON GetSmallWindowIcon() const override { return nullptr; }
+#endif
   void OnBeforeWidgetInit(Widget::InitParams* params,
                           internal::NativeWidgetDelegate* delegate) override;
   ui::ContextFactory* GetContextFactory() override;
 
  private:
   ui::ContextFactory* context_factory_;
   bool use_desktop_native_widgets_;
   bool use_transparent_windows_;
 
 #if defined(USE_AURA)
   scoped_ptr<wm::WMState> wm_state_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(TestViewsDelegate);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_TEST_TEST_VIEWS_DELEGATE_H_