Convert JavascriptAlertActivatesTab to browser_tests framework.

chrome/test/ui_test_utils.h

Index: chrome/test/ui_test_utils.h
diff --git a/chrome/test/ui_test_utils.h b/chrome/test/ui_test_utils.h
index 34c8545945aa7e6d5cde8a696634a308145ab002..3b2aef913d7bc50ca553d38bb3242196eadea395 100644
--- a/chrome/test/ui_test_utils.h
+++ b/chrome/test/ui_test_utils.h
@@ -11,6 +11,7 @@
 #include "base/string16.h"
 #include "chrome/common/notification_observer.h"
 
+class AppModalDialog;
 class Browser;
 class DownloadManager;
 class GURL;
@@ -85,6 +86,10 @@ GURL GetTestUrl(const std::wstring& dir, const std::wstring file);
 // Creates an observer that waits for |download_manager| to report that it
 // has a total of |count| downloads that have been handles
 void WaitForDownloadCount(DownloadManager* download_manager, size_t count);
+
+// Blocks until an application modal dialog is showns and returns it.
+AppModalDialog* WaitForAppModalDialog();
+
 }
 
 #endif  // CHROME_TEST_UI_TEST_UTILS_H_