This document explains how to clear saved passwords and form data in Google Chrome.
Click on the wrench icon > Tools > Clear browsing data....
Check the following:
Select the beginning of time in the drop down box and click on the Clear browsing data button.
Click on Tools (the wrench icon) > Options.
Click on the Under the Hood tab, then the Clear browsing data... button.
Check the following:
Select the beginning of time in the drop down box and click on the Clear browsing data button.