Unify some SkNx code

tests/SkNxTest.cpp

Index: tests/SkNxTest.cpp
diff --git a/tests/SkNxTest.cpp b/tests/SkNxTest.cpp
index b3e03d0a9b6a7674c564cb55d802cf88b90e00f1..754e9800b12963bbebf04de4239f985426cc8502 100644
--- a/tests/SkNxTest.cpp
+++ b/tests/SkNxTest.cpp
@@ -207,21 +207,6 @@ DEF_TEST(Sk4px_widening, r) {
     REPORTER_ASSERT(r, 0 == memcmp(&wideLoHi, &wideLoHiAlt, sizeof(wideLoHi)));
 }
 
-DEF_TEST(Sk4f_toBytes, r) {
-    uint8_t bytes[4];
-
-    // toBytes truncates, not rounds.
-    Sk4f(0.7f).toBytes(bytes);
-    REPORTER_ASSERT(r, bytes[0] == 0);
-
-    // Clamping edge cases.
-    Sk4f(-2.0f, -0.7f, 255.9f, 256.0f).toBytes(bytes);
-    REPORTER_ASSERT(r, bytes[0] == 0);
-    REPORTER_ASSERT(r, bytes[1] == 0);
-    REPORTER_ASSERT(r, bytes[2] == 255);
-    REPORTER_ASSERT(r, bytes[3] == 255);
-}
-
 DEF_TEST(SkNx_cast, r) {
     Sk4f fs(-1.7f, -1.4f, 0.5f, 1.9f);
     Sk4i is = SkNx_cast<int>(fs);