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The work around is to be more aggressive about sending
multipart data before we have a response header.  We used
to buffer a response until we had the full frame.

This avoids a crash in webcore by behaving more like
CFNetwork.  It also makes us behave more like Gecko,
which is probably good for compat.

The original patch (r47599) broke plugins on Windows because
it was depending on the assumption that we would send data
as one big chunk.  Now that we send data as multiple chunks,
we need to update the data offset being sent to the plugin.

BUG=30880

Review URL: http://codereview.chromium.org/2787002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@49355 0039d316-1c4b-4281-b951-d872f2087c98