GitLab

Following the PSA for API deprecations, the following are removed:

 - GPUTextureDescriptor.arrayLayerCount
 - GPUTextureCopyView.arrayLayer
 - GPUBuffer.setSubData

Also updates a couple uses of the deprecated WGPUBufferCopyView members.

Bug: dawn:22
Change-Id: If826f85a42cb9c713bb958ef29a512b8583e3f41
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2351970Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797404}