CCleaner version: v4.06.4324
Chrome version: 30.0.1599.101
Windows 7 Professional 32bit with SP1
Steps to reproduce:
1) Open Chrome, go to an HTML5 offline enabled site such as: http://html5demos.com/offlineapp
2) Close Chrome
3) Run CCleaner, ensure all Chrome related options are checked, and clean
4) Open Chrome, go to chrome://appcache-internals/
Step 4 will still show that there are HTML5 appcache files still cached.