Sync patch r14380 from main trunk.
When finish using the browser storage for one formset, browser should clean the ConfigRequest string for this formset.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/branches/UDK2010.SR1@14381 6f19259b-4bc3-4df7-8a09-765794883524