Remove legacy draggable region code and refactor to share common draggable region code

chrome/chrome_browser_ui.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_ui',
       'type': 'static_library',
@@ skipping 753 matching lines @@
         'browser/ui/constrained_window_tab_helper.cc',
         'browser/ui/constrained_window_tab_helper.h',
         'browser/ui/constrained_window_tab_helper_delegate.cc',
         'browser/ui/constrained_window_tab_helper_delegate.h',
         'browser/ui/crypto_module_password_dialog.cc',
         'browser/ui/crypto_module_password_dialog.h',
         'browser/ui/crypto_module_password_dialog_nss.cc',
         'browser/ui/crypto_module_password_dialog_openssl.cc',
         'browser/ui/extensions/application_launch.cc',
         'browser/ui/extensions/application_launch.h',
+        'browser/ui/extensions/native_shell_window.cc',
         'browser/ui/extensions/native_shell_window.h',
         'browser/ui/extensions/shell_window.cc',
         'browser/ui/extensions/shell_window.h',
         'browser/ui/find_bar/find_bar.h',
         'browser/ui/find_bar/find_bar_controller.cc',
         'browser/ui/find_bar/find_bar_controller.h',
         'browser/ui/find_bar/find_bar_state.h',
         'browser/ui/find_bar/find_bar_state_factory.cc',
         'browser/ui/find_bar/find_bar_state_factory.h',
         'browser/ui/find_bar/find_notification_details.h',
@@ skipping 1884 matching lines @@
             ['exclude', '^browser/ui/views/select_file_dialog_extension.cc'],
             ['exclude', '^browser/ui/views/select_file_dialog_extension.h'],
             ['exclude', '^browser/ui/views/select_file_dialog_extension_factory.cc'],
             ['exclude', '^browser/ui/views/select_file_dialog_extension_factory.h'],
           ]}
         ],
       ],
     },
   ],
 }