local storage cache doesn't work

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Visit modpagespeed.com, navigate to the 'after' page for local_storage_cache
2. Open the chrome developer tools (ctrl-shift-i)
3. Refresh the page a few times and look at Resources/Local Storage, and 
Network.

What is the expected output? What do you see instead?
Actual)   nothing is written to LS and the resources are fetched every time.
Expected) the inline CSS and img should be saved in LS and in later fetches the 
CSS should not be fetched and the IMG should have a Latency of 0ms (meaning 
it's being fetched from memory/LS).

Original issue reported on code.google.com by matterb...@google.com on 15 Nov 2012 at 10:00