Cleans up gyp file for views example and removes duplicate code

ui/views/examples/examples_window_with_content.h

Index: ui/views/examples/examples_window_with_content.h
diff --git a/ui/views/examples/examples_window_with_content.h b/ui/views/examples/examples_window_with_content.h
index 907d3075a28ae07a3267086f76d40df2f8e46747..407fd2eeb7ee994da22f4efa3f3390765ab5daf2 100644
--- a/ui/views/examples/examples_window_with_content.h
+++ b/ui/views/examples/examples_window_with_content.h
@@ -6,6 +6,7 @@
 #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 {
@@ -15,11 +16,6 @@ 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,