Latest Steam stable update (Jan 2025) fails to start due to CEF crash loop
Steam fails to start up since last week's update due to a crash in CEF's network service, indicated by webhelper-linux.txt:
```
[2025-01-27 16:23:23] terminate called after throwing an instance of 'std::out_of_range'
[2025-01-27 16:23:23]   what():  basic_string::at: __n (which is 0) >= this->size() (which is 0)
[2025-01-27 16:23:23] [0127/162323.751259:ERROR:network_service_instance_impl.cc(600)] Network service crashed, restarting service.
[2025-01-27 16:23:23] [DEBUG] Hiding directory entry for RootFSFD
[2025-01-27 16:23:23] [DEBUG] Hiding directory entry for RootFSFD
[2025-01-27 16:23:23] terminate called after throwing an instance of 'std::out_of_range'
[2025-01-27 16:23:23]   what():  basic_string::at: __n (which is 0) >= this->size() (which is 0)
[2025-01-27 16:23:23] [0127/162323.912938:ERROR:network_service_instance_impl.cc(600)] Network service crashed, restarting service.
[2025-01-27 16:23:23] [DEBUG] Hiding directory entry for RootFSFD
[2025-01-27 16:23:23] [DEBUG] Hiding directory entry for RootFSFD
[2025-01-27 16:23:23] terminate called after throwing an instance of 'std::out_of_range'
[2025-01-27 16:23:23]   what():  basic_string::at: __n (which is 0) >= this->size() (which is 0)
[2025-01-27 16:23:24] [0127/162324.060614:ERROR:network_service_instance_impl.cc(600)] Network service crashed, restarting service.

...
```

This has been reproduced on 3 different devices (macbook with Linux VM, X13s, T14s). Downgrading the Steam client to the 20241204072114 update reliably resolves the problem.