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

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_SERIALIZATION_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_SERIALIZATION_H_
 
 #include <string.h>  // For |memcpy()|.
 
 #include <vector>
@@ skipping 226 matching lines @@
     internal::Array_Data<F>* result =
         internal::Array_Data<F>::New(input.size(), buf);
     if (result) {
       internal::ArraySerializer<E, F>::template SerializeElements<
           ValidateParams::element_is_nullable,
           typename ValidateParams::ElementValidateParams>(
               internal::Forward(input), buf, result);
     }
     *output = result;
   } else {
-    *output = NULL;
+    *output = nullptr;
   }
 }
 
 template <typename E, typename F>
 inline void Deserialize_(internal::Array_Data<F>* input, Array<E>* output) {
   if (input) {
     internal::ArraySerializer<E, F>::DeserializeElements(input, output);
   } else {
     output->reset();
   }
 }
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_SERIALIZATION_H_