Revert "Update legacy Tuple-using code."

sandbox/linux/seccomp-bpf/codegen.cc

Index: sandbox/linux/seccomp-bpf/codegen.cc
diff --git a/sandbox/linux/seccomp-bpf/codegen.cc b/sandbox/linux/seccomp-bpf/codegen.cc
index 055aa71e11c743690d72866e44be5f8e9e129dcb..df9676017a07a119e2f53eb25bfd676a191781a2 100644
--- a/sandbox/linux/seccomp-bpf/codegen.cc
+++ b/sandbox/linux/seccomp-bpf/codegen.cc
@@ -145,14 +145,14 @@ size_t CodeGen::Offset(Node target) const {
 // TODO(mdempsky): Move into a general base::Tuple helper library.
 bool CodeGen::MemoKeyLess::operator()(const MemoKey& lhs,
                                       const MemoKey& rhs) const {
-  if (get<0>(lhs) != get<0>(rhs))
-    return get<0>(lhs) < get<0>(rhs);
-  if (get<1>(lhs) != get<1>(rhs))
-    return get<1>(lhs) < get<1>(rhs);
-  if (get<2>(lhs) != get<2>(rhs))
-    return get<2>(lhs) < get<2>(rhs);
-  if (get<3>(lhs) != get<3>(rhs))
-    return get<3>(lhs) < get<3>(rhs);
+  if (lhs.a != rhs.a)
+    return lhs.a < rhs.a;
+  if (lhs.b != rhs.b)
+    return lhs.b < rhs.b;
+  if (lhs.c != rhs.c)
+    return lhs.c < rhs.c;
+  if (lhs.d != rhs.d)
+    return lhs.d < rhs.d;
   return false;
 }