Vulkan: Remove vk::ErrorOrResult. The ErrorOrResult pattern doesn't help much. Removing it enables the Error passing refactor in the Vulkan back-end. Bug: angleproject:2713 Change-Id: I4e8277ad856c785bf22b4d37b7ae880b534ef005 Reviewed-on: https://chromium-review.googlesource.com/1128919 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Frank Henigman <fjhenigman@chromium.org>