Convert WindowOpenDisposition to an enum class.

chrome/browser/unload_browsertest.cc

Index: chrome/browser/unload_browsertest.cc
diff --git a/chrome/browser/unload_browsertest.cc b/chrome/browser/unload_browsertest.cc
index a2d1b00b532bd941d2dea098fa6d8c7677eee762..60b291c73af1e71f1ef587063f467d5a7f360a61 100644
--- a/chrome/browser/unload_browsertest.cc
+++ b/chrome/browser/unload_browsertest.cc
@@ -153,7 +153,8 @@ class UnloadTest : public InProcessBrowserTest {
   // page without waiting for the first load to complete.
   void NavigateToNolistenersFileTwiceAsync() {
     GURL url(net::URLRequestMockHTTPJob::GetMockUrl("title2.html"));
-    ui_test_utils::NavigateToURLWithDisposition(browser(), url, CURRENT_TAB, 0);
+    ui_test_utils::NavigateToURLWithDisposition(
+        browser(), url, WindowOpenDisposition::CURRENT_TAB, 0);
     ui_test_utils::NavigateToURL(browser(), url);
     CheckTitle("Title Of Awesomeness");
   }
@@ -438,7 +439,7 @@ class FastUnloadTest : public UnloadTest {
 
   void NavigateToPageInNewTab(const char* name) {
     ui_test_utils::NavigateToURLWithDisposition(
-        browser(), GetUrl(name), NEW_FOREGROUND_TAB,
+        browser(), GetUrl(name), WindowOpenDisposition::NEW_FOREGROUND_TAB,
         ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
     CheckTitle(name);
   }