C++ bindings: A struct's Deserialize() now does validation before deserializing.

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

Index: mojo/public/cpp/bindings/lib/bindings_internal.h
diff --git a/mojo/public/cpp/bindings/lib/bindings_internal.h b/mojo/public/cpp/bindings/lib/bindings_internal.h
index 7889fa6f9365d01354d50a9f56e453bdfcf9cf76..7479cd1d95a5b94e16862ec001f706ea436dffda 100644
--- a/mojo/public/cpp/bindings/lib/bindings_internal.h
+++ b/mojo/public/cpp/bindings/lib/bindings_internal.h
@@ -98,6 +98,8 @@ struct IsHandle {
   enum { value = std::is_base_of<Handle, H>::value };
 };
 
+// TODO(vardhan): Replace RemoveStructPtr<> and UnwrapStructPtr<> with
+// specializations of std::pointer_traits<> on [Inlined]StructPtr<>.
 template <typename T>
 struct RemoveStructPtr {
   typedef T type;