Don't lose content change during rollback for loader already started

If a loader is already started when we try to rollback a content
change, force a new load instead of simply setting the flag to refresh
next time.

Bug 28406183

https://code.google.com/p/android/issues/detail?id=208278

Change-Id: I3b257f8e7d1828ce9fae095bcddc7aa195fb6792
1 file changed