guard rasterizer and drawlooper setters

tests/QuickRejectTest.cpp

Index: tests/QuickRejectTest.cpp
diff --git a/tests/QuickRejectTest.cpp b/tests/QuickRejectTest.cpp
index 7eb80f1712b134cf67ed30e3a632caea4053175e..582789aa7561930847280fe374c5273d87972dee 100644
--- a/tests/QuickRejectTest.cpp
+++ b/tests/QuickRejectTest.cpp
@@ -82,7 +82,7 @@ static void test_drawBitmap(skiatest::Reporter* reporter) {
     // to the left. The test is to ensure that canvas' quickReject machinary
     // allows us through, even though sans-looper we would look like we should
     // be clipped out.
-    paint.setLooper(new TestLooper)->unref();
+    paint.setLooper(sk_make_sp<TestLooper>());
     canvas.drawBitmap(src, SkIntToScalar(-10), 0, &paint);
     REPORTER_ASSERT(reporter, 0xFFFFFFFF == *dst.getAddr32(5, 5));
 }