Remove unrolled-loop path from gaussian convolution effect.

This only existed for ES2 devices, which can now use the fixed-length
loop approach.

Change-Id: I8042c0baa89539cad47a4ee321eafa5fa0a33879
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/541071
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed