Convert WindowOpenDisposition to an enum class.

chrome/browser/ui/ime/ime_window.cc

 // Copyright 2016 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/ime/ime_window.h"
 
 #include <utility>
 
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 53 matching lines @@
   content::WebContents::CreateParams create_params(profile,
                                                    std::move(site_instance));
   if (opener_render_frame_host) {
     create_params.opener_render_process_id =
         opener_render_frame_host->GetProcess()->GetID();
     create_params.opener_render_frame_id =
         opener_render_frame_host->GetRoutingID();
   }
   web_contents_.reset(content::WebContents::Create(create_params));
   web_contents_->SetDelegate(this);
-  content::OpenURLParams params(gurl, content::Referrer(), SINGLETON_TAB,
+  content::OpenURLParams params(gurl, content::Referrer(),
+                                WindowOpenDisposition::SINGLETON_TAB,
                                 ui::PAGE_TRANSITION_LINK, false);
   web_contents_->OpenURL(params);
 
   native_window_ = CreateNativeWindow(this, bounds, web_contents_.get());
 }
 
 void ImeWindow::Show() {
   native_window_->Show();
 }
 
@@ skipping 105 matching lines @@
   bounds.set_width(pos.width());
   bounds.set_height(pos.height());
   native_window_->SetBounds(bounds);
 }
 
 bool ImeWindow::IsPopupOrPanel(const content::WebContents* source) const {
   return true;
 }
 
 }  // namespace ui