Chrome 22 Developer Tools - Global Sources Search not working right (ctrl-shift-f)
To get an older version of Chrome your best bet is to find a build of Chromium from https://chromium-build.appspot.com/p/chromium/console however if this if for devtools stability you are missing out on a lot of new features and bug fixes.
As for Search across all files it is still there and CTRL-SHIFT-F on Windows and CMD-OPT-F on Mac. See Addy Osmani's post https://plus.google.com/115133653231679625609/posts/e4W2kdrFJY9
If you find issues as bugs, it is better to raise the issue on http://crbug.com/new as it will get direct attention from the engineering team there.