Cleans up gyp file for views example and removes duplicate code

ui/views/examples/examples_window_with_content.h

 // Copyright (c) 2012 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 UI_VIEWS_EXAMPLES_EXAMPLES_WINDOW_WITH_CONTENT_H_
 #define UI_VIEWS_EXAMPLES_EXAMPLES_WINDOW_WITH_CONTENT_H_
 
 #include "ui/gfx/native_widget_types.h"
+#include "ui/views/examples/examples_window.h"
 #include "ui/views/examples/views_examples_with_content_export.h"
 
 namespace content {
 class BrowserContext;
 }
 
 namespace views {
 namespace examples {
 
-enum Operation {
-  DO_NOTHING_ON_CLOSE = 0,
-  QUIT_ON_CLOSE,
-};
-
 // Shows a window with the views examples in it.
 VIEWS_EXAMPLES_WITH_CONTENT_EXPORT void ShowExamplesWindowWithContent(
     Operation operation,
     content::BrowserContext* browser_context,
     gfx::NativeView window_context);
 
 }  // namespace examples
 }  // namespace views
 
 #endif  // UI_VIEWS_EXAMPLES_EXAMPLES_WINDOW_WITH_CONTENT_H_