A proxy server is a server that acts as an intermediary between your computer and other servers. Right now, your system is configured to use a proxy, but Google Chrome can't connect to it.

If you use a proxy server...
Check your proxy settings or contact your network administrator to make sure the proxy server is working. If you don't believe you should be using a proxy server: Go to the Chrome menu > Settings > Show advanced settings... > Change proxy settings... > LAN Settings and deselect "Use a proxy server for your LAN".
Error code: ERR_PROXY_CONNECTION_FAILED