Revision 1493272

Revert r1446177, which tweaked the closing time of a blame stream.

This patch caused a huge performance regression in some specific configuration
triggered by the SharpSvn build.

It also makes it clearer where we stop using the stream to help in applying the
performance improvements I discussed today with jcorvel around reusing files
instead of creating a tempfile for every new revision.

* subversion/libsvn_client/blame.c
  (delta_baton):
  (window_handler):
  (file_rev_handler):
    Revert r1446177.