Create DomAgent and CSSAgent in Chrome.

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index 020ad593c923950bbbe630025ff6ad7a660824ef..3228b3254f73473aa691839629112cea7e0d55ab 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -62,10 +62,6 @@ class UserActivityDetector;
 class UserActivityPowerManagerNotifier;
 }
 
-namespace ui_devtools {
-class UiDevToolsServer;
-}
-
 namespace views {
 class NonClientFrameView;
 class Widget;
@@ -719,7 +715,6 @@ class ASH_EXPORT Shell : public SessionObserver,
   std::unique_ptr<::wm::WindowModalityController> window_modality_controller_;
   std::unique_ptr<app_list::AppList> app_list_;
   std::unique_ptr<::PrefService> pref_service_;
-  std::unique_ptr<ui_devtools::UiDevToolsServer> devtools_server_;
   std::unique_ptr<views::corewm::TooltipController> tooltip_controller_;
   LinkHandlerModelFactory* link_handler_model_factory_;
   std::unique_ptr<PowerButtonController> power_button_controller_;