bpf_dsl: fix argument-dependent lookup of BoolExpr operators

sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc

Index: sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
diff --git a/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc b/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
index 145df9b94fcc5cb5ef7a8edcc9a1cbe85c40e268..8830d8e63d289a768d58266d5245dc3c971029a6 100644
--- a/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
+++ b/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
@@ -88,11 +88,6 @@ using sandbox::bpf_dsl::Error;
 using sandbox::bpf_dsl::If;
 using sandbox::bpf_dsl::ResultExpr;
 
-// TODO(mdempsky): Make BoolExpr a standalone class so these operators can
-// be resolved via argument-dependent lookup.
-using sandbox::bpf_dsl::operator||;
-using sandbox::bpf_dsl::operator&&;
-
 namespace sandbox {
 
 // Allow Glibc's and Android pthread creation flags, crash on any other