Convert WindowOpenDisposition to an enum class.

chrome/browser/extensions/extension_crash_recovery_browsertest.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 <stddef.h>
 
 #include "base/run_loop.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
@@ skipping 536 matching lines @@
   EXPECT_EQ(tabs_before, tab_strip->count());
   EXPECT_EQ(count_before, GetEnabledExtensionCount());
   EXPECT_EQ(crash_count_before + 1, GetTerminatedExtensionCount());
 
   {
     content::WindowedNotificationObserver observer(
         content::NOTIFICATION_LOAD_STOP,
         content::Source<NavigationController>(
             &browser()->tab_strip_model()->GetActiveWebContents()->
                 GetController()));
-    chrome::Reload(browser(), CURRENT_TAB);
+    chrome::Reload(browser(), WindowOpenDisposition::CURRENT_TAB);
     observer.Wait();
   }
   // Extension should now be loaded.
   SCOPED_TRACE("after reloading the tab");
   CheckExtensionConsistency(first_extension_id_);
   ASSERT_EQ(count_before + 1, GetEnabledExtensionCount());
   ASSERT_EQ(0U, CountBalloons());
 }