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

mojo/public/cpp/bindings/lib/bindings_serialization.cc

Index: mojo/public/cpp/bindings/lib/bindings_serialization.cc
diff --git a/mojo/public/cpp/bindings/lib/bindings_serialization.cc b/mojo/public/cpp/bindings/lib/bindings_serialization.cc
index 53fd61645ab720746087ea320cc69c16d1d4cee4..7161efef10843bb1751d504ee0be95a3510b8cd8 100644
--- a/mojo/public/cpp/bindings/lib/bindings_serialization.cc
+++ b/mojo/public/cpp/bindings/lib/bindings_serialization.cc
@@ -50,7 +50,7 @@ void EncodePointer(const void* ptr, uint64_t* offset) {
 
 const void* DecodePointerRaw(const uint64_t* offset) {
   if (!*offset)
-    return NULL;
+    return nullptr;
   return reinterpret_cast<const char*>(offset) + *offset;
 }