Convert WindowOpenDisposition to an enum class.

chrome/browser/platform_util_chromeos.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/platform_util.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "chrome/browser/chromeos/file_manager/open_util.h"
 #include "chrome/browser/platform_util_internal.h"
@@ skipping 90 matching lines @@
   // This code should be obsolete since we have default handlers in ChromeOS
   // which should handle this. However - there are two things which make it
   // necessary to keep it in:
   // a.) The user might have deleted the default handler in this session.
   //     In this case we would need to have this in place.
   // b.) There are several code paths which are not clear if they would call
   //     this function directly and which would therefore break (e.g.
   //     "Browser::EmailPageLocation" (to name only one).
   // As such we should keep this code here.
   chrome::NavigateParams params(profile, url, ui::PAGE_TRANSITION_LINK);
-  params.disposition = NEW_FOREGROUND_TAB;
+  params.disposition = WindowOpenDisposition::NEW_FOREGROUND_TAB;
 
   if (url.SchemeIs("mailto")) {
     std::string string_url = kGmailComposeUrl;
     string_url.append(url.spec());
     params.url = GURL(url);
   }
 
   chrome::Navigate(&params);
 }
 
 }  // namespace platform_util