Correct sRGB <-> linear everywhere.

src/effects/gradients/Sk4fGradientPriv.h

Index: src/effects/gradients/Sk4fGradientPriv.h
diff --git a/src/effects/gradients/Sk4fGradientPriv.h b/src/effects/gradients/Sk4fGradientPriv.h
index 9745119fd4a23659adc8b60984d3da956dce5b5b..6542683eb0a47cdf8cada494a7adc98e5f94f268 100644
--- a/src/effects/gradients/Sk4fGradientPriv.h
+++ b/src/effects/gradients/Sk4fGradientPriv.h
@@ -109,18 +109,16 @@ struct DstTraits<DstType::S32, premul> {
     using Type = SkPMColor;
 
     static Sk4f load(const SkPM4f& c) {
-        // Prescaling by (255^2, 255^2, 255^2, 255) on load, to avoid a 255 multiply on
-        // each store (S32 conversion yields a uniform 255 factor).
-        return c.to4f_pmorder() * Sk4f(255 * 255, 255 * 255, 255 * 255, 255);
+        return c.to4f_pmorder();
     }
 
     static void store(const Sk4f& c, Type* dst) {
         // FIXME: this assumes opaque colors.  Handle unpremultiplication.
-        *dst = to_4b(linear_to_srgb(PM::apply(c)));
+        *dst = Sk4f_toS32(PM::apply(c));
     }
 
     static void store(const Sk4f& c, Type* dst, int n) {
-        sk_memset32(dst, to_4b(linear_to_srgb(PM::apply(c))), n);
+        sk_memset32(dst, Sk4f_toS32(PM::apply(c)), n);
     }
 
     static void store4x(const Sk4f& c0, const Sk4f& c1,