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

chrome/browser/extensions/test_bookmark_app_helper.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_TEST_BOOKMARK_APP_HELPER_H_
+#define CHROME_BROWSER_EXTENSIONS_TEST_BOOKMARK_APP_HELPER_H_
+
+#include "chrome/browser/extensions/bookmark_app_helper.h"
+
+namespace extensions {
+namespace test {
+
+class TestBookmarkAppHelper : public extensions::BookmarkAppHelper {

[benwells, 2017/06/06 03:31:50]

What's the point of this class?

[tapted, 2017/06/06 07:44:12]

Added a comment.

(OnDidGetManifest and OnIconsDownloaded are private in BookmarkAppHelper)

+ public:
+  TestBookmarkAppHelper(Profile* profile,
+                        WebApplicationInfo web_app_info,
+                        content::WebContents* contents)
+      : BookmarkAppHelper(profile, web_app_info, contents) {}
+  ~TestBookmarkAppHelper() override {}
+
+ protected:
+  // Allow subclasses to call these.
+  using BookmarkAppHelper::OnDidGetManifest;
+  using BookmarkAppHelper::OnIconsDownloaded;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestBookmarkAppHelper);
+};
+
+}  // namespace test
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_TEST_BOOKMARK_APP_HELPER_H_