Remove GrGpu::getWritePixelsInfo

Change-Id: I30f9eed774b0b659ee91949a234bcc112fbee035
Reviewed-on: https://skia-review.googlesource.com/131480
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
9 files changed