Make ParentPermissionDialog not display optional permissions

This matches the behavior of regular extension install dialog in
the same situaton, because the parent permission dialog is never used
for delegated permissions, which the only time optional permissions
are shown in the regular extension install dialog, as can be seen at:
https://cs.chromium.org/chromium/src/chrome/browser/extensions/extension_install_prompt.cc?l=602

See bug for a concrete example of where this inconsistency appears.

Bug: 1067037
Change-Id: I5aab8d159d9abc8ba73347be187d0fdcb4034a70
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2133217Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Dan S <danan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755924}

chrome/browser/ui/views/parent_permission_dialog_view.cc

@@ -689,7 +689,11 @@ void ParentPermissionDialogView::InitializeExtensionData(
   std::unique_ptr<const extensions::PermissionSet> permissions_to_display =
       extensions::util::GetInstallPromptPermissionSetForExtension(
           extension.get(), params_->profile,
-          true /* include_optional_permissions */);
+          // Matches behavior of regular extension install prompt because this
+          // prompt is never used for delegated permissions, which the only
+          // time optional permissions are shown.
+          false /* include_optional_permissions */
+      );
   extensions::Manifest::Type type = extension->GetType();
   prompt_permissions_.LoadFromPermissionSet(permissions_to_display.get(), type);