Is there a "Find and Replace" function in Chrome Web Inspector? If it exists, where can I find it? I'm using Chrome 26.0.1410.64, if it matters.
Nothing built in natively. There is a Search and Replace
plugin that might help if you want to change text in the input fields.
Alternatively if you want to search and replace in the HTML
you could Right Click → Edit as HTML the <body>
in the DevTools Elements Panel select all the text with Ctrl+a, paste into your favourite editor, make the change there and paste it back.