makes two callbacks -- one to determine the charset and one to provide
an nsIUnicharInputStream. Use this in the CSSLoader instead of
allocating a single big buffer for the sheet. Clean up the way we look
for the @charset charset in the sheet data.
r=rpotts for netwerk/, r=peterv for content/, r=smontagu for intl/,
sr=darin for the whole thing.
git-svn-id: svn://10.0.0.236/trunk@128310 18797224-902f-48f8-a5cc-f745e15eee43
8b530edf64