Fix crash when user closes window prior to the "Confirm Install" prompt showing

chrome/browser/ui/native_window_tracker_browsertest.cc

+// Copyright 2014 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.
+
+#include "chrome/browser/ui/native_window_tracker.h"
+
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_window.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "content/public/test/test_utils.h"
+
+typedef InProcessBrowserTest NativeWindowTrackerTest;
+
+IN_PROC_BROWSER_TEST_F(NativeWindowTrackerTest, Basic) {
+  // Create a second browser to prevent the app from exiting when the browser is
+  // closed.
+  CreateBrowser(browser()->profile());
+
+  scoped_ptr<NativeWindowTracker> tracker =
+      NativeWindowTracker::Create(browser()->window()->GetNativeWindow());
+  EXPECT_FALSE(tracker->WasNativeWindowClosed());
+
+  browser()->window()->Close();
+  content::RunAllPendingInMessageLoop();
+  EXPECT_TRUE(tracker->WasNativeWindowClosed());
+}