SpdyFramer now uses HPACK for SPDY4 headers (re-apply)
SpdyFramer defers calling OnControlFrameHeadersData() until the entire HPACK
headers block has been decoded. At that point, the block is re-encoded to
legacy SPDY3 format and passed to the visitor.
This is a temporary measure suitable for testing only, intended to allow
a decoupled switch to HPACK prior to being fully wired for
SpdyHeadersHandlerInterface.
This lands server change
62461978 by jgraettinger.
BUG=339578
Review URL: https://codereview.chromium.org/
201373002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257857 0039d316-1c4b-4281-b951-d872f2087c98