Vulkan: Fix a state notification change that was wrong That state change should really be in the frontend and not in each backend. Bug: angleproject:2594 Change-Id: I9d9396563ce42a41587b954892d6b4c6002c5072 Reviewed-on: https://chromium-review.googlesource.com/1101252 Commit-Queue: Luc Ferron <lucferron@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>