Convert WindowOpenDisposition to an enum class.

chrome/browser/chromeos/login/signin/oauth2_browsertest.cc

 // Copyright 2014 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 <utility>
 
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
@@ skipping 704 matching lines @@
   return browser;
 }
 
 IN_PROC_BROWSER_TEST_F(MergeSessionTest, PageThrottle) {
   StartNewUserSession(false);
 
   // Try to open a page from google.com.
   Browser* browser =
       FindOrCreateVisibleBrowser(profile());
   ui_test_utils::NavigateToURLWithDisposition(
-      browser,
-      fake_google_page_url_,
-      CURRENT_TAB, ui_test_utils::BROWSER_TEST_NONE);
+      browser, fake_google_page_url_, WindowOpenDisposition::CURRENT_TAB,
+      ui_test_utils::BROWSER_TEST_NONE);
 
   // Wait until we get send merge session request.
   WaitForMergeSessionToStart();
 
   // Make sure the page is blocked by the throttle.
   EXPECT_FALSE(fake_google_.IsPageRequested());
 
   // Check that throttle page is displayed instead.
   base::string16 title;
   ui_test_utils::GetCurrentTabTitle(browser, &title);
@@ skipping 68 matching lines @@
 
   if (!catcher.GetNextResult()) {
     std::string message = catcher.message();
     ADD_FAILURE() << "Tests failed: " << message;
   }
 
   EXPECT_TRUE(fake_google_.IsPageRequested());
 }
 
 }  // namespace chromeos