Revert "fix for uninitialized GrGLSLFragmentShaderBuilder field"
Revert "fix for uninitialized GrGLSLFragmentShaderBuilder field"

This reverts commit 4543e75a840ef24c33237d329ab8f0d84632e3f2.

Reason for revert: prequisite to reverting 05d5a13fea6246648de7e41358ed338d53c85ea2

Original change's description:
> fix for uninitialized GrGLSLFragmentShaderBuilder field
> 
> Bug: skia:
> Change-Id: I5041c96528910d24978a5c2578efa29d6a89a343
> Reviewed-on: https://skia-review.googlesource.com/46982
> Commit-Queue: Ethan Nicholas <d2cfb8c2f603266f4dc3a6f09acbcc0089603b37@google.com>
> Commit-Queue: Stephan Altmueller <stephana@google.com>
> Reviewed-by: Stephan Altmueller <stephana@google.com>

TBR=stephana@google.com,d2cfb8c2f603266f4dc3a6f09acbcc0089603b37@google.com

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

Bug: skia:
Change-Id: Iaad1453725964f018aa47d8dd2df5c2f7aa3272a
Reviewed-on: https://skia-review.googlesource.com/47721
Reviewed-by: Ethan Nicholas <d2cfb8c2f603266f4dc3a6f09acbcc0089603b37@google.com>
Commit-Queue: Ethan Nicholas <d2cfb8c2f603266f4dc3a6f09acbcc0089603b37@google.com>

HalCanary/skia-hc,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,rubenvb/skia,HalCanary/skia-hc,rubenvb/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,rubenvb/skia,HalCanary/skia-hc,google/skia,rubenvb/skia,rubenvb/skia,Hikari-no-Tenshi/android_external_skia,Hikari-no-Tenshi/android_external_skia,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,Hikari-no-Tenshi/android_external_skia,rubenvb/skia,HalCanary/skia-hc,HalCanary/skia-hc,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,HalCanary/skia-hc,rubenvb/skia,rubenvb/skia,Hikari-no-Tenshi/android_external_skia,rubenvb/skia,google/skia,google/skia,google/skia,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,Hikari-no-Tenshi/android_external_skia,google/skia,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,rubenvb/skia