Remove unused isValid parameter from GrVkBackendSurfaceInfo::assign

Change-Id: I294d7db9364748f8a2bcdb9875657721a32a0f20
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/743417
Commit-Queue: Greg Daniel <egdaniel@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
3 files changed