Convert WindowOpenDisposition to an enum class.

chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc

 // Copyright 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/ui/toolbar/recent_tabs_sub_menu_model.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/metrics/histogram.h"
@@ skipping 274 matching lines @@
     chrome::ExecuteCommandWithDisposition(browser_, IDC_SHOW_HISTORY,
         ui::DispositionFromEventFlags(event_flags));
     return;
   }
 
   DCHECK_NE(IDC_RECENT_TABS_NO_DEVICE_TABS, command_id);
   DCHECK(!IsDeviceNameCommandId(command_id));
 
   WindowOpenDisposition disposition =
       ui::DispositionFromEventFlags(event_flags);
-  if (disposition == CURRENT_TAB)  // Force to open a new foreground tab.
-    disposition = NEW_FOREGROUND_TAB;
+  if (disposition == WindowOpenDisposition::CURRENT_TAB) {
+    // Force to open a new foreground tab.
+    disposition = WindowOpenDisposition::NEW_FOREGROUND_TAB;
+  }
 
   sessions::TabRestoreService* service =
       TabRestoreServiceFactory::GetForProfile(browser_->profile());
   sessions::LiveTabContext* context =
       BrowserLiveTabContext::FindContextForWebContents(
           browser_->tab_strip_model()->GetActiveWebContents());
   if (IsTabModelCommandId(command_id)) {
     TabNavigationItems* tab_items = NULL;
     int tab_items_idx = CommandIdToTabVectorIndex(command_id, &tab_items);
     const TabNavigationItem& item = (*tab_items)[tab_items_idx];
@@ skipping 418 matching lines @@
 
   ui::MenuModelDelegate* menu_model_delegate = GetMenuModelDelegate();
   if (menu_model_delegate)
     menu_model_delegate->OnMenuStructureChanged();
 }
 
 void RecentTabsSubMenuModel::TabRestoreServiceDestroyed(
     sessions::TabRestoreService* service) {
   TabRestoreServiceChanged(service);
 }