Revert of Implement approx-match support in image filter saveLayer() offscreen.

src/gpu/effects/GrTextureDomain.h

Index: src/gpu/effects/GrTextureDomain.h
diff --git a/src/gpu/effects/GrTextureDomain.h b/src/gpu/effects/GrTextureDomain.h
index 0331260be93d9d801f81cdf3a2632faee60d0a5f..7efd9f2dee1850d1d054582be3e577b9df5ff829 100644
--- a/src/gpu/effects/GrTextureDomain.h
+++ b/src/gpu/effects/GrTextureDomain.h
@@ -67,19 +67,6 @@
             texelRect.fBottom * hInv
         };
         return result;
-    }
-
-    static const SkRect MakeTexelDomainForMode(const GrTexture* texture, const SkIRect& texelRect, Mode mode) {
-        // For Clamp mode, inset by half a texel.
-        SkScalar wInv = SK_Scalar1 / texture->width();
-        SkScalar hInv = SK_Scalar1 / texture->height();
-        SkScalar inset = mode == kClamp_Mode ? SK_ScalarHalf : 0;
-        return SkRect::MakeLTRB(
-            (texelRect.fLeft + inset) * wInv,
-            (texelRect.fTop + inset) * hInv,
-            (texelRect.fRight - inset) * wInv,
-            (texelRect.fBottom - inset) * hInv
-        );
     }
 
     bool operator== (const GrTextureDomain& that) const {