This makes it less likely for the implementation to conflict with other
ASSIGN_OR_RETURN() and RETURN_IF_ERROR() implementations.
PiperOrigin-RevId: 570726994
This fixes:
```
error: private field 'buffer_aligned_size_' is not used [-Werror,-Wunused-private-field]
87 | int64 buffer_aligned_size_{};
| ^
```
in the downstream Chrome build.
PiperOrigin-RevId: 565221813