WebGPU: Handle Dawn breaking change in CreateInstance Needed in order to update Dawn to match the standard webgpu.h, here: https://dawn-review.googlesource.com/c/dawn/+/245242 Bug: chromium:414868137 Change-Id: I2bdf5bd5747a8da8ed0612a99d70eee8a3d09ecb Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6652516 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org> Auto-Submit: Kai Ninomiya <kainino@chromium.org>