cros: Remove CoreOobeHandler::Delegate.

chrome/browser/ui/webui/chromeos/login/oobe_ui.h

Index: chrome/browser/ui/webui/chromeos/login/oobe_ui.h
diff --git a/chrome/browser/ui/webui/chromeos/login/oobe_ui.h b/chrome/browser/ui/webui/chromeos/login/oobe_ui.h
index b7d9be0a03f86bcaaccdf98dea436efe586c65b8..a9796391815e6c91f1a5c00704e9c900a353d1da 100644
--- a/chrome/browser/ui/webui/chromeos/login/oobe_ui.h
+++ b/chrome/browser/ui/webui/chromeos/login/oobe_ui.h
@@ -67,7 +67,6 @@ class WrongHWIDScreenView;
 // - eula screen (CrOS (+ OEM) EULA content/TPM password/crash reporting).
 // - update screen.
 class OobeUI : public content::WebUIController,
-               public CoreOobeHandler::Delegate,
                public ShutdownPolicyHandler::Delegate {
  public:
   // List of known types of OobeUI. Type added as path in chrome://oobe url, for
@@ -127,6 +126,9 @@ class OobeUI : public content::WebUIController,
   // Initializes the handlers.
   void InitializeHandlers();
 
+  // Called when the screen has changed.
+  void CurrentScreenChanged(OobeScreen screen);
+
   // Invoked after the async assets load. The screen handler that has the same
   // async assets load id will be initialized.
   void OnScreenAssetsLoaded(const std::string& async_assets_load_id);
@@ -184,9 +186,6 @@ class OobeUI : public content::WebUIController,
   void AddWebUIHandler(std::unique_ptr<BaseWebUIHandler> handler);
   void AddScreenHandler(std::unique_ptr<BaseScreenHandler> handler);
 
-  // CoreOobeHandler::Delegate implementation:
-  void OnCurrentScreenChanged(OobeScreen screen) override;
-
   // Type of UI.
   std::string display_type_;