Removing the autofill enum which does not have reference in blink side

public/web/WebAutofillClient.h

 /*
  * Copyright (C) 2010 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 25 matching lines @@
 class WebFormElement;
 class WebFrame;
 class WebInputElement;
 class WebKeyboardEvent;
 class WebNode;
 
 template <typename T> class WebVector;
 
 class WebAutofillClient {
 public:
-    enum {
-        MenuItemIDAutocompleteEntry = 0,
-        MenuItemIDWarningMessage = -1,
-        MenuItemIDPasswordEntry = -2,
-        MenuItemIDSeparator = -3,
-        MenuItemIDClearForm = -4,
-        MenuItemIDAutofillOptions = -5,
-        MenuItemIDDataListEntry = -6
-    };
-
     // Informs the browser an interactive autocomplete has been requested.
     virtual void didRequestAutocomplete(WebFrame*, const WebFormElement&) { }
 
     // These methods are called when the users edits a text-field.
     virtual void textFieldDidEndEditing(const WebInputElement&) { }
     virtual void textFieldDidChange(const WebInputElement&) { }
     virtual void textFieldDidReceiveKeyDown(const WebInputElement&, const WebKeyboardEvent&) { }
     // This is called when a datalist indicator is clicked.
     virtual void openTextDataListChooser(const WebInputElement&) { }
 
     // Informs the client whether or not any subsequent text changes should be ignored.
     virtual void setIgnoreTextChanges(bool ignore) { }
 
     virtual void didAssociateFormControls(const WebVector<WebNode>&) { }
 
 protected:
     virtual ~WebAutofillClient() { }
 };
 
 } // namespace blink
 
 #endif