Add Browser::SkipCallBeforeUnload so that the browser windows can be closed regardless of beforeunl…

chrome/browser/ui/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chromecast_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 868 matching lines @@
       "toolbar/toolbar_actions_bar.h",
       "toolbar/toolbar_actions_bar_bubble_delegate.h",
       "toolbar/toolbar_actions_bar_delegate.h",
       "toolbar/toolbar_actions_bar_observer.h",
       "translate/translate_bubble_factory.cc",
       "translate/translate_bubble_factory.h",
       "uma_browsing_activity_observer.cc",
       "uma_browsing_activity_observer.h",
       "unload_controller.cc",
       "unload_controller.h",
+      "unload_controller_web_contents_delegate.cc",
+      "unload_controller_web_contents_delegate.h",
       "user_manager.cc",
       "user_manager.h",
       "website_settings/chooser_bubble_delegate.cc",
       "website_settings/chooser_bubble_delegate.h",
       "website_settings/permission_menu_model.cc",
       "website_settings/permission_menu_model.h",
       "website_settings/website_settings_infobar_delegate.cc",
       "website_settings/website_settings_infobar_delegate.h",
       "webui/app_launcher_login_handler.cc",
       "webui/app_launcher_login_handler.h",
@@ skipping 2597 matching lines @@
       "test/test_confirm_bubble_model.cc",
       "test/test_confirm_bubble_model.h",
     ]
     deps += [ "//chrome/test:test_support_ui" ]
   }
 
   if (enable_extensions) {
     deps += [ "//extensions/browser" ]
   }
 }