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

Review URL: https://codereview.chromium.org/1316233002
diff --git a/src/codec/SkMaskSwizzler.cpp b/src/codec/SkMaskSwizzler.cpp
index 95f3627..58be0c6 100644
--- a/src/codec/SkMaskSwizzler.cpp
+++ b/src/codec/SkMaskSwizzler.cpp
@@ -225,7 +225,7 @@
         const SkImageInfo& info, SkMasks* masks, uint32_t bitsPerPixel) {
 
     // Choose the appropriate row procedure
-    RowProc proc = NULL;
+    RowProc proc = nullptr;
     switch (bitsPerPixel) {
         case 16:
             switch (info.colorType()) {
@@ -319,7 +319,7 @@
             break;
         default:
             SkASSERT(false);
-            return NULL;
+            return nullptr;
     }
     return new SkMaskSwizzler(info, masks, proc);
 }
@@ -342,6 +342,6 @@
  *
  */
 SkSwizzler::ResultAlpha SkMaskSwizzler::swizzle(void* dst, const uint8_t* SK_RESTRICT src) {
-    SkASSERT(NULL != dst && NULL != src);
+    SkASSERT(nullptr != dst && nullptr != src);
     return fRowProc(dst, src, fDstInfo.width(), fMasks);
 }