Convert WindowOpenDisposition to an enum class.

chrome/browser/ui/cocoa/view_id_util_browsertest.mm

 // 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 "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "chrome/browser/devtools/devtools_window_testing.h"
 #include "chrome/browser/download/download_shelf.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 97 matching lines @@
   ASSERT_NO_FATAL_FAILURE(DoTest());
 }
 
 IN_PROC_BROWSER_TEST_F(ViewIDTest, Tab) {
   CheckViewID(VIEW_ID_TAB_0, true);
   CheckViewID(VIEW_ID_TAB_LAST, true);
 
   // Open 9 new tabs.
   for (int i = 1; i <= 9; ++i) {
     CheckViewID(static_cast<ViewID>(VIEW_ID_TAB_0 + i), false);
-    browser()->OpenURL(OpenURLParams(GURL(url::kAboutBlankURL),
-                                     Referrer(),
-                                     NEW_BACKGROUND_TAB,
-                                     ui::PAGE_TRANSITION_TYPED,
-                                     false));
+    browser()->OpenURL(OpenURLParams(GURL(url::kAboutBlankURL), Referrer(),
+                                     WindowOpenDisposition::NEW_BACKGROUND_TAB,
+                                     ui::PAGE_TRANSITION_TYPED, false));
     CheckViewID(static_cast<ViewID>(VIEW_ID_TAB_0 + i), true);
     // VIEW_ID_TAB_LAST should always be available.
     CheckViewID(VIEW_ID_TAB_LAST, true);
   }
 
   // Open the 11th tab.
-  browser()->OpenURL(OpenURLParams(GURL(url::kAboutBlankURL),
-                                   Referrer(),
-                                   NEW_BACKGROUND_TAB,
-                                   ui::PAGE_TRANSITION_TYPED,
-                                   false));
+  browser()->OpenURL(OpenURLParams(GURL(url::kAboutBlankURL), Referrer(),
+                                   WindowOpenDisposition::NEW_BACKGROUND_TAB,
+                                   ui::PAGE_TRANSITION_TYPED, false));
   CheckViewID(VIEW_ID_TAB_LAST, true);
 }