Convert WindowOpenDisposition to an enum class.

chrome/browser/push_messaging/push_messaging_browsertest.cc

Index: chrome/browser/push_messaging/push_messaging_browsertest.cc
diff --git a/chrome/browser/push_messaging/push_messaging_browsertest.cc b/chrome/browser/push_messaging/push_messaging_browsertest.cc
index 68df46d10f61ea1c42f26c60f8d11d699cf69ee0..4f2482c9cb58017392bb5dbe4714e84a15d6f07a 100644
--- a/chrome/browser/push_messaging/push_messaging_browsertest.cc
+++ b/chrome/browser/push_messaging/push_messaging_browsertest.cc
@@ -791,7 +791,8 @@ IN_PROC_BROWSER_TEST_F(PushMessagingBrowserTest,
 
   // Open a blank foreground tab so site is no longer visible.
   ui_test_utils::NavigateToURLWithDisposition(
-      GetBrowser(), GURL("about:blank"), NEW_FOREGROUND_TAB,
+      GetBrowser(), GURL("about:blank"),
+      WindowOpenDisposition::NEW_FOREGROUND_TAB,
       ui_test_utils::BROWSER_TEST_WAIT_FOR_TAB);
 
   // If the Service Worker push event handler shows a notification, we
@@ -908,7 +909,8 @@ IN_PROC_BROWSER_TEST_F(PushMessagingBrowserTest,
       GetBrowser()->tab_strip_model()->GetActiveWebContents();
 
   ui_test_utils::NavigateToURLWithDisposition(
-      GetBrowser(), GURL("about:blank"), NEW_FOREGROUND_TAB,
+      GetBrowser(), GURL("about:blank"),
+      WindowOpenDisposition::NEW_FOREGROUND_TAB,
       ui_test_utils::BROWSER_TEST_WAIT_FOR_TAB);
 
   SetSiteEngagementScore(web_contents->GetURL(), 0.0);