Revert HTTP/0.9 removal
This broke compatibility with the Tenda D301 router, which is using
HTTP/0.9 (Presumably because of a bug in the router's firmare).
We're going to go with a less aggressive deprecation instead, at least
for now - we'll just support HTTP/0.9 on default ports only.
I'll try to be more aggressive in future Chrome releases (No HTTP/0.9
over SSL, for instance).
Reverted CL description:
Remove HTTP/0.9 support from HttpStreamParser.
HTTP/0.9 is an ancient protocol with some fundamental design problems.
This CL remove support for it, while leaving most of the code needed to
support HTTP/0.9 in place, in case this has to be reverted late in the
game, or we decide to add a (temporary) enterprise policy to enable it.