Revert "third_party/protobuf: Update to HEAD (83d681ee2c)"

third_party/protobuf/src/google/protobuf/stubs/callback.h

Index: third_party/protobuf/src/google/protobuf/stubs/callback.h
diff --git a/third_party/protobuf/src/google/protobuf/stubs/callback.h b/third_party/protobuf/src/google/protobuf/stubs/callback.h
index bbd507a84ba21c89bd73def76f68c55b2819e076..87271c5eb8f58692cc967c9dbdc3c9814810c6c6 100644
--- a/third_party/protobuf/src/google/protobuf/stubs/callback.h
+++ b/third_party/protobuf/src/google/protobuf/stubs/callback.h
@@ -381,8 +381,6 @@ class MethodResultCallback_5_2 : public ResultCallback2<R, A1, A2> {
   typename remove_reference<P5>::type p5_;
 };
 
-}  // namespace internal
-
 // See Closure.
 inline Closure* NewCallback(void (*function)()) {
   return new internal::FunctionClosure0(function, true);
@@ -535,6 +533,8 @@ inline ResultCallback2<R, A1, A2>* NewPermanentCallback(
                                                     p2, p3, p4, p5);
 }
 
+}  // namespace internal
+
 // A function which does nothing.  Useful for creating no-op callbacks, e.g.:
 //   Closure* nothing = NewCallback(&DoNothing);
 void LIBPROTOBUF_EXPORT DoNothing();