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

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

Index: chrome/browser/chromeos/login/ui/lock_window.h
diff --git a/chrome/browser/chromeos/login/ui/lock_window.h b/chrome/browser/chromeos/login/ui/lock_window.h
index 9fbc0fea696927c4451cb05dc11c5a4a2f2a794d..ef58686f2ba54cf1ca1870805a419f3e5a78171e 100644
--- a/chrome/browser/chromeos/login/ui/lock_window.h
+++ b/chrome/browser/chromeos/login/ui/lock_window.h
@@ -19,41 +19,19 @@ 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;
   }
 
-  // views::WidgetDelegate:
-  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;
+  views::Widget* GetWidget() override;
+  const views::Widget* GetWidget() const override;
 
   // The view which should be initially focused.
   views::View* initially_focused_view_ = nullptr;