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

Review URL: https://codereview.chromium.org/1316233002
diff --git a/gm/complexclip.cpp b/gm/complexclip.cpp
index 74c877d..bcbd7fd 100644
--- a/gm/complexclip.cpp
+++ b/gm/complexclip.cpp
@@ -115,7 +115,7 @@
             boundPaint.setColor(SK_ColorRED);
             boundPaint.setStyle(SkPaint::kStroke_Style);
             canvas->drawRect(bounds, boundPaint);
-            canvas->saveLayer(&bounds, NULL);
+            canvas->saveLayer(&bounds, nullptr);
         }
 
         for (int invBits = 0; invBits < 4; ++invBits) {