Mojo: Convert the remaining OVERRIDEs to override in mojo/.

mojo/examples/window_manager/debug_panel.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 MOJO_EXAMPLES_WINDOW_MANAGER_DEBUG_PANEL_H_
 #define MOJO_EXAMPLES_WINDOW_MANAGER_DEBUG_PANEL_H_
 
 #include <string>
 
+#include "base/macros.h"
 #include "mojo/services/public/interfaces/navigation/navigation.mojom.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/layout/layout_manager.h"
 #include "ui/views/widget/widget_delegate.h"
 
 namespace views {
 class Label;
 class RadioButton;
 }
 
@@ skipping 21 matching lines @@
     virtual ~Delegate(){}
   };
 
   DebugPanel(Delegate* delegate, View* view);
   virtual ~DebugPanel();
 
   Target navigation_target() const;
 
  private:
   // LayoutManager overrides:
-  virtual gfx::Size GetPreferredSize(const views::View* view) const OVERRIDE;
-  virtual void Layout(views::View* host) OVERRIDE;
+  virtual gfx::Size GetPreferredSize(const views::View* view) const override;
+  virtual void Layout(views::View* host) override;
   virtual void ButtonPressed(views::Button* sender,
-                             const ui::Event& event) OVERRIDE;
+                             const ui::Event& event) override;
 
   void Navigate(const std::string& url);
 
   Delegate* delegate_;
   View* view_;
 
   views::Label* navigation_target_label_;
   views::RadioButton* navigation_target_new_;
   views::RadioButton* navigation_target_source_;
   views::RadioButton* navigation_target_default_;
 
   views::Button* colored_square_;
   views::Button* close_last_;
   views::Button* cross_app_;
 
   DISALLOW_COPY_AND_ASSIGN(DebugPanel);
 };
 
 }  // examples
 }  // mojo
 
 #endif  //  MOJO_EXAMPLES_WINDOW_MANAGER_DEBUG_PANEL_H_