Convert WindowOpenDisposition to an enum class.

chrome/browser/ui/views/sync/profile_signin_confirmation_dialog_views.cc

 // Copyright 2013 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/views/sync/profile_signin_confirmation_dialog_views.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 217 matching lines @@
 }
 
 void ProfileSigninConfirmationDialogViews::StyledLabelLinkClicked(
     views::StyledLabel* label,
     const gfx::Range& range,
     int event_flags) {
   chrome::NavigateParams params(
       browser_,
       GURL("https://support.google.com/chromebook/answer/1331549"),
       ui::PAGE_TRANSITION_LINK);
-  params.disposition = NEW_POPUP;
+  params.disposition = WindowOpenDisposition::NEW_POPUP;
   params.window_action = chrome::NavigateParams::SHOW_WINDOW;
   chrome::Navigate(&params);
 }
 
 void ProfileSigninConfirmationDialogViews::ButtonPressed(
     views::Button* sender,
     const ui::Event& event) {
   DCHECK(prompt_for_new_profile_);
   if (delegate_) {
     delegate_->OnContinueSignin();
     delegate_ = NULL;
   }
   GetWidget()->Close();
 }