Remove legacy SELECT popup code.

public/web/WebPopupMenu.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 20 matching lines @@
 #ifndef WebPopupMenu_h
 #define WebPopupMenu_h
 
 #include "../platform/WebCommon.h"
 #include "WebWidget.h"
 
 namespace blink {
 
 class WebWidgetClient;
 
+// TODO(tkent): Remove this class and WebPopupTypeSelect.
 class WebPopupMenu : public WebWidget {
 public:
-    BLINK_EXPORT static WebPopupMenu* create(WebWidgetClient*);
+    static WebPopupMenu* create(WebWidgetClient*) { return nullptr; }
 };
 
 } // namespace blink
 
 #endif