Convert WindowOpenDisposition to an enum class.

chrome/browser/ui/webui/settings/md_settings_ui_browsertest.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 <string>
 
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/url_constants.h"
@@ skipping 24 matching lines @@
 #define MAYBE_BackForwardDoesntCrash DISABLED_BackForwardDoesntCrash
 #else
 #define MAYBE_BackForwardDoesntCrash BackForwardDoesntCrash
 #endif
 
 IN_PROC_BROWSER_TEST_F(MdSettingsUITest, MAYBE_BackForwardDoesntCrash) {
   NavigateToURL(browser(), GURL(chrome::kChromeUIMdSettingsURL));
 
   NavigateToURL(browser(), GURL(chrome::kChromeUINewTabURL));
 
-  chrome::GoBack(browser(), CURRENT_TAB);
+  chrome::GoBack(browser(), WindowOpenDisposition::CURRENT_TAB);
   WaitForLoadStop(browser()->tab_strip_model()->GetActiveWebContents());
 }
 
 // Catch lifetime issues in message handlers. There was previously a problem
 // with PrefMember calling Init again after Destroy.
 IN_PROC_BROWSER_TEST_F(MdSettingsUITest, ToggleJavaScript) {
   NavigateToURL(browser(), GURL(chrome::kChromeUIMdSettingsURL));
 
   const auto& handlers = *browser()
                               ->tab_strip_model()
                               ->GetActiveWebContents()
                               ->GetWebUI()
                               ->GetHandlersForTesting();
 
   for (content::WebUIMessageHandler* handler : handlers) {
     handler->AllowJavascriptForTesting();
     handler->DisallowJavascript();
     handler->AllowJavascriptForTesting();
   }
 }