Remove unused dstColorSpace from getROPixels

Bug: skia:
Change-Id: Id5f03f2c82706f5f82c24ff735805c85ad0b069d
Reviewed-on: https://skia-review.googlesource.com/c/163883
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
13 files changed