cros: Cleanup lock screen and OOBE C++ backing code.

chrome/browser/chromeos/login/ui/lock_window.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOCK_WINDOW_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOCK_WINDOW_H_
 
 #include "base/macros.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
 
 namespace views {
 class View;
 class Widget;
 }
 
 namespace chromeos {
 
 // Shows the widget for the WebUI screen locker.
 class LockWindow : public views::Widget, public views::WidgetDelegate {
  public:
-  // This class provides an interface for the lock window to notify an observer
-  // about its status.
-  class Observer {
-   public:
-    // This method will be called when the lock window has finished all
-    // initialization.
-    virtual void OnLockWindowReady() = 0;
-  };
-
   LockWindow();
   ~LockWindow() override;
 
-  // Attempt to grab inputs on the webview, the actual view displaying the lock
-  // screen WebView.
-  void Grab();
-
-  // Sets the observer class which is notified on lock window events.
-  void set_observer(Observer* observer) { observer_ = observer; }
-
   // Sets the view which should be initially focused.
   void set_initially_focused_view(views::View* view) {
     initially_focused_view_ = view;
   }
 
+ private:
   // views::WidgetDelegate:
+  views::View* GetInitiallyFocusedView() override;
   views::Widget* GetWidget() override;
   const views::Widget* GetWidget() const override;
 
- private:
-  // views::WidgetDelegate:
-  views::View* GetInitiallyFocusedView() override;
-
-  // The observer's OnLockWindowReady method will be called when the lock
-  // window has finished all initialization.
-  Observer* observer_ = nullptr;
-
   // The view which should be initially focused.
   views::View* initially_focused_view_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(LockWindow);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOCK_WINDOW_H_