Remove GrGLCaps::fTextureRedSupport

Change-Id: I585e70378beeef63466de88b5cbe4aa56c15df6e
Reviewed-on: https://skia-review.googlesource.com/95662
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2 files changed