Remove duplicate member of GrVkDrawableInfo struct.

Bug: skia:
Change-Id: I81a38f9920f89f4749fc58458b85a29714cec7a9
Reviewed-on: https://skia-review.googlesource.com/c/174584
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
3 files changed