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

chrome/browser/ui/views/extensions/extension_install_dialog_view_browsertest.cc

Index: chrome/browser/ui/views/extensions/extension_install_dialog_view_browsertest.cc
diff --git a/chrome/browser/ui/views/extensions/extension_install_dialog_view_browsertest.cc b/chrome/browser/ui/views/extensions/extension_install_dialog_view_browsertest.cc
index 368929dc133a5fe6ba50f3de16f79c0a05a9c954..4b129afa7c3cdffd4bfca86eb47e4d6e6e0f3590 100644
--- a/chrome/browser/ui/views/extensions/extension_install_dialog_view_browsertest.cc
+++ b/chrome/browser/ui/views/extensions/extension_install_dialog_view_browsertest.cc
@@ -161,16 +161,16 @@ ScrollbarTest::ScrollbarTest()
 }
 
 bool ScrollbarTest::IsScrollbarVisible() {
-  ExtensionInstallPrompt::ShowParams show_params(web_contents());
   ExtensionInstallDialogView* dialog = new ExtensionInstallDialogView(
-      show_params.profile,
-      show_params.parent_web_contents,
+      profile(),
+      web_contents(),
       delegate(),
       prompt());
 
   // Create the modal view around the install dialog view.
   views::Widget* modal =
-      CreateBrowserModalDialogViews(dialog, show_params.parent_window);
+      CreateBrowserModalDialogViews(dialog,
+                                    web_contents()->GetTopLevelNativeWindow());
   modal->Show();
   content::RunAllBlockingPoolTasksUntilIdle();