gistfile1.txt

/* Add these lines to 
~/Library/Application\ Support/Google/Chrome/Default/User\ StyleSheets/Custom.css
Other OSes here: http://darcyclarke.me/design/skin-your-chrome-inspector/
*/

#-webkit-web-inspector.platform-mac.platform-mac-snowleopard .monospace, 
#-webkit-web-inspector.platform-mac.platform-mac-snowleopard .source-code
{
    font-family: Consolas, Monaco, monospace !important;
}