Make HWNDMessageHandler build with use_aura==1

ui/ui.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     'ui_resources.gypi',
@@ skipping 499 matching lines @@
         ['use_aura==1', {
           'sources/': [
             ['exclude', 'gfx/gtk_'],
             ['exclude', 'gfx/gtk_util.cc'],
             ['exclude', 'gfx/gtk_util.h'],
             ['exclude', 'gfx/screen_gtk.cc'],
             ['exclude', 'gfx/screen_win.cc'],
             ['exclude', 'base/dialogs/select_file_dialog_mac.mm'],
             ['exclude', 'base/dialogs/select_file_dialog_win.cc'],
             ['exclude', 'base/dragdrop/drag_utils_win.cc'],
-            ['exclude', 'base/win/mouse_wheel_util.cc'],
-            ['exclude', 'base/win/mouse_wheel_util.h'],
             ['exclude', 'base/work_area_watcher_observer.h'],
             ['exclude', 'base/x/active_window_watcher_x.cc'],
             ['exclude', 'base/x/active_window_watcher_x.h'],
             ['exclude', 'base/x/active_window_watcher_x_observer.h'],
             ['exclude', 'base/x/root_window_property_watcher_x.cc'],
             ['exclude', 'base/x/root_window_property_watcher_x.h'],
             ['exclude', 'base/x/work_area_watcher_x.cc'],
             ['exclude', 'base/x/work_area_watcher_x.h'],
             ['exclude', 'ui_controls_win.cc'],
            ],
@@ skipping 242 matching lines @@
     },
   ],
   'conditions': [
     ['inside_chromium_build == 1', {
       'includes': [
         'ui_unittests.gypi',
       ]},
     ],
   ],
 }