This CL changes ValidateStorageClassLayouts to take the
valid_type_storage_layouts_ as a parameter instead of accessing
directly.
Bug: tint:1313
Change-Id: I2eade6abd9b0acf3d8937c08b0453682be8864fa
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/87147
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>