Use BookmarkAppConfirmationView on Mac. Delete the NSAlert Mac uses currently.

chrome/browser/extensions/bookmark_app_helper_unittest.cc

Index: chrome/browser/extensions/bookmark_app_helper_unittest.cc
diff --git a/chrome/browser/extensions/bookmark_app_helper_unittest.cc b/chrome/browser/extensions/bookmark_app_helper_unittest.cc
index 7294811c7a4e38d1781006be8fc248e4a1e8279d..da3146b29c72be31202557eca88a8bfafcd45d8a 100644
--- a/chrome/browser/extensions/bookmark_app_helper_unittest.cc
+++ b/chrome/browser/extensions/bookmark_app_helper_unittest.cc
@@ -277,8 +277,6 @@ void TestIconGeneration(int icon_size,
                                             expected_resized);
 }
 
-}  // namespace
-
 class TestBookmarkAppHelper : public BookmarkAppHelper {
  public:
   TestBookmarkAppHelper(ExtensionService* service,
@@ -311,6 +309,8 @@ class TestBookmarkAppHelper : public BookmarkAppHelper {
   DISALLOW_COPY_AND_ASSIGN(TestBookmarkAppHelper);
 };
 
+}  // namespace
+
 TEST_F(BookmarkAppHelperExtensionServiceTest, CreateBookmarkApp) {
   WebApplicationInfo web_app_info;
   web_app_info.app_url = GURL(kAppUrl);