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

Review URL: https://codereview.chromium.org/1316233002
diff --git a/gm/giantbitmap.cpp b/gm/giantbitmap.cpp
index e8bfad4..571dbd8 100644
--- a/gm/giantbitmap.cpp
+++ b/gm/giantbitmap.cpp
@@ -25,7 +25,7 @@
     bool fDoRotate;
 
     const SkBitmap& getBitmap() {
-        if (NULL == fBM) {
+        if (nullptr == fBM) {
             fBM = new SkBitmap;
             fBM->allocN32Pixels(W, H);
             fBM->eraseColor(SK_ColorWHITE);
@@ -60,7 +60,7 @@
     }
 
 public:
-    GiantBitmapGM(SkShader::TileMode mode, bool doFilter, bool doRotate) : fBM(NULL) {
+    GiantBitmapGM(SkShader::TileMode mode, bool doFilter, bool doRotate) : fBM(nullptr) {
         fMode = mode;
         fDoFilter = doFilter;
         fDoRotate = doRotate;