Revert "Fix performance regresion on Mali, while preserving sk_FragCoord.w"

This reverts commit a34e6eac3c6a765a28abc15e132534652a6295d2.

Reason for revert: Broken gold images on Adreno 530 and 540

Original change's description:
> Fix performance regresion on Mali, while preserving sk_FragCoord.w
> 
> Bug: skia:
> Change-Id: I9269288bbb861cd02efa7b5dfe2c9434ec39064e
> Reviewed-on: https://skia-review.googlesource.com/c/174309
> Commit-Queue: Michael Ludwig <michaelludwig@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com,michaelludwig@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: skia:
Change-Id: Id344219c101564a5fd06477895386fad2d8dfa78
Reviewed-on: https://skia-review.googlesource.com/c/175986
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
2 files changed