Remove gl-mock hack

I don't see any references to CanvasResourceProviderTextureGpuMemoryBuffer
anymore in Chromium.

Originally added in http://review.skia.org/204221

Change-Id: Ie7e5fceec3e9cee9b768d7b53bacf1e9d8abe933
Bug: b/293490566
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/731085
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
1 file changed