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

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

Index: mojo/public/cpp/bindings/lib/array_internal.h
diff --git a/mojo/public/cpp/bindings/lib/array_internal.h b/mojo/public/cpp/bindings/lib/array_internal.h
index b512295e40314bf31beaa63a33d92202aa1eb8c9..c49409a3216e253646902887734194dba2025154 100644
--- a/mojo/public/cpp/bindings/lib/array_internal.h
+++ b/mojo/public/cpp/bindings/lib/array_internal.h
@@ -332,11 +332,11 @@ class Array_Data {
   typedef typename Traits::ConstRef ConstRef;
   typedef ArraySerializationHelper<T, IsHandle<T>::value> Helper;
 
-  // Returns NULL if |num_elements| or the corresponding storage size cannot be
+  // Returns null if |num_elements| or the corresponding storage size cannot be
   // stored in uint32_t.
   static Array_Data<T>* New(size_t num_elements, Buffer* buf) {
     if (num_elements > Traits::kMaxNumElements)
-      return NULL;
+      return nullptr;
 
     uint32_t num_bytes =
         Traits::GetStorageSize(static_cast<uint32_t>(num_elements));