Style Change: NULL->nullptr

src/utils/SkBase64.h

Index: src/utils/SkBase64.h
diff --git a/src/utils/SkBase64.h b/src/utils/SkBase64.h
index ba66dd2f47796bc16dc2143c84e0665725003994..13350b7b682cd30fe7d2e22e37ffd16e4778aec4 100644
--- a/src/utils/SkBase64.h
+++ b/src/utils/SkBase64.h
@@ -26,7 +26,7 @@ public:
        encode[64] will be used as the pad character. Encodings other than the
        default encoding cannot be decoded.
     */
-    static size_t Encode(const void* src, size_t length, void* dest, const char* encode = NULL);
+    static size_t Encode(const void* src, size_t length, void* dest, const char* encode = nullptr);
 
 private:
     Error decode(const void* srcPtr, size_t length, bool writeDestination);