Ensure default dialog button focus remains after a dialog update.

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 3ac2aad73a91ff6b16669548fa43c09893c00b2d..152e0786f4b8ccc4e74b8306ff44063b0f42dbe5 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
@@ -221,5 +221,8 @@ IN_PROC_BROWSER_TEST_F(ExtensionInstallDialogViewTest, InstallButtonDelay) {
   // Check OK button state after timeout to verify that it is re-enabled.
   base::RunLoop().RunUntilIdle();
   EXPECT_TRUE(delegate_view->IsDialogButtonEnabled(ui::DIALOG_BUTTON_OK));
+
+  // Ensure default button (cancel) has focus.
+  EXPECT_TRUE(delegate_view->GetInitiallyFocusedView()->HasFocus());
   delegate_view->Close();
 }