Vulkan: Remove traces of VK_MSRTSS_GOOGLEX Devices that shipped this unreleased extension should have long been updated to VK_MSRTSS_EXT Bug: angleproject:4836 Change-Id: I23736ebf28afd4a6f3b5b0d5a6417b3e7564c293 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5627575 Auto-Submit: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Yuxin Hu <yuxinhu@google.com> Reviewed-by: Yuxin Hu <yuxinhu@google.com>