Style Change: NULL->nullptr
DOCS_PREVIEW= https://skia.org/?cl=1316233002

Review URL: https://codereview.chromium.org/1316233002
diff --git a/tests/SkImageTest.cpp b/tests/SkImageTest.cpp
index fabc1fd..8817f0b 100644
--- a/tests/SkImageTest.cpp
+++ b/tests/SkImageTest.cpp
@@ -33,7 +33,7 @@
     tgt.allocN32Pixels(gWidth, gHeight);
     SkCanvas canvas(tgt);
     canvas.clear(SK_ColorTRANSPARENT);
-    canvas.drawImage(image, 0, 0, NULL);
+    canvas.drawImage(image, 0, 0, nullptr);
 
     uint32_t pixel = 0;
     SkImageInfo info = SkImageInfo::Make(1, 1, kBGRA_8888_SkColorType, kUnpremul_SkAlphaType);