Mojo: NULL -> nullptr in mojo/public/cpp/bindings and also for the bindings generator.

mojo/public/cpp/bindings/lib/array_serialization.h

Index: mojo/public/cpp/bindings/lib/array_serialization.h
diff --git a/mojo/public/cpp/bindings/lib/array_serialization.h b/mojo/public/cpp/bindings/lib/array_serialization.h
index fc62a88d57fe8883973a4625ff16741478ebd84a..4407de850d676ec73d9d76286846141968a71750 100644
--- a/mojo/public/cpp/bindings/lib/array_serialization.h
+++ b/mojo/public/cpp/bindings/lib/array_serialization.h
@@ -244,7 +244,7 @@ inline void SerializeArray_(Array<E> input, internal::Buffer* buf,
     }
     *output = result;
   } else {
-    *output = NULL;
+    *output = nullptr;
   }
 }