Fixes AsyncFragmentLoader.haveInitialFragmentsLoaded().  In its
previous state, it could allow code to load before prerequisite
initial code had loaded.

Review by: scottb


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@5335 8db76d5a-ed1c-0410-87a9-c151d255dfc7