Make the WebContentsUserData locator key private.

chrome/browser/ui/gtk/autofill/autofill_external_delegate_gtk.cc

 // 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.
 
 #include "chrome/browser/ui/gtk/autofill/autofill_external_delegate_gtk.h"
 
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/gtk/autofill/autofill_popup_view_gtk.h"
 #include "chrome/browser/ui/gtk/gtk_theme_service.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view.h"
 
 void AutofillExternalDelegate::CreateForWebContentsAndManager(
     content::WebContents* web_contents,
     AutofillManager* autofill_manager) {
   if (FromWebContents(web_contents))
     return;
 
   web_contents->SetUserData(
-      &kLocatorKey,
+      UserDataKey(),
       new AutofillExternalDelegateGtk(web_contents, autofill_manager));
 }
 
 AutofillExternalDelegateGtk::AutofillExternalDelegateGtk(
     content::WebContents* web_contents,
     AutofillManager* autofill_manager)
     : AutofillExternalDelegate(web_contents, autofill_manager),
       event_handler_id_(0) {
   tab_native_view_ = web_contents->GetView()->GetNativeView();
 }
@@ skipping 57 matching lines @@
         this);
   }
 }
 
 gboolean AutofillExternalDelegateGtk::HandleViewFocusOut(GtkWidget* sender,
                                                          GdkEventFocus* event) {
   HideAutofillPopup();
 
   return TRUE;
 }