Change error messages for too large headers that match
ConnectionImpl::checkMaxHeadersSize() behavior.

When http-parser parses a piece of data, it immediately calls
ParserCallbacks::onHeaderField() or ParserCallbacks::onHeaderValue()
with the current fragment of header key or value, and
ConnectionImpl::checkMaxHeadersSize() checks size limit each time.

On the other hand, BalsaFrame buffers the header key and value and only
calls BalsaVisitorInterface::OnHeader() when the given header completes.
In order to prevent from memory attacks, the header size limit is passed
to BalsaFrame through BalsaParser constructor, and BalsaFrame internally
enforces the limit while parsing.

Signed-off-by: Bence Béky <bnc@google.com>

Signed-off-by: Bence Béky <bnc@google.com>

Signed-off-by: Bence Béky <bnc@google.com>

Signed-off-by: Bence Béky <bnc@google.com>

Signed-off-by: Bence Béky <bnc@google.com>

… flag.

Signed-off-by: Bence Béky <bnc@google.com>

Signed-off-by: Bence Béky <bnc@google.com>

Signed-off-by: Bence Béky <bnc@google.com>

Signed-off-by: Bence Béky <bnc@google.com>