Remove unused fields related to old multitexturing TextureOp.

Change-Id: I6a48410f2203a0a88831d02713b9b7475fb6e5a6
Reviewed-on: https://skia-review.googlesource.com/c/192826
Commit-Queue: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>

include/gpu/GrContextOptions.h

@@ -218,12 +218,6 @@ struct GrContextOptions {
      * Include or exclude specific GPU path renderers.
      */
     GpuPathRenderers fGpuPathRenderers = GpuPathRenderers::kAll;
-
-    /**
-     * Disables using multiple texture units to batch multiple images into a single draw on
-     * supported GPUs.
-     */
-    bool fDisableImageMultitexturing = false;
 #endif
 
 #if SK_SUPPORT_ATLAS_TEXT

src/gpu/GrShaderCaps.h

@@ -295,8 +295,6 @@ private:
 
     int fMaxFragmentSamplers;
 
-    size_t fDisableImageMultitexturingDstRectAreaThreshold;
-
     AdvBlendEqInteraction fAdvBlendEqInteraction;
 
     GrSwizzle fConfigTextureSwizzle[kGrPixelConfigCnt];