Convert WindowOpenDisposition to an enum class.

chrome/browser/ui/cocoa/view_id_util_browsertest.mm

Index: chrome/browser/ui/cocoa/view_id_util_browsertest.mm
diff --git a/chrome/browser/ui/cocoa/view_id_util_browsertest.mm b/chrome/browser/ui/cocoa/view_id_util_browsertest.mm
index 55103fe0506225c6a7ad12113cc29a05a1ad80e0..b935b4c5493b0487cb3d2df21f20b644bd3f9445 100644
--- a/chrome/browser/ui/cocoa/view_id_util_browsertest.mm
+++ b/chrome/browser/ui/cocoa/view_id_util_browsertest.mm
@@ -115,21 +115,17 @@ IN_PROC_BROWSER_TEST_F(ViewIDTest, Tab) {
   // 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);
 }