CHROMIUM: Revert SFE IPv6 asymmetric QoS

Revert SFE asymmetric QoS support for IPv6 introduced in CL
chromium:1717644. In addition to the asymmetric QoS support this also
reverts the handling of ICMP error messages that trigger recreation
of flow state for an embedded IP packet.

This is a workaround to prevent IPv6 forwarding from wedging when
there is simultaneous high rate IPv4 traffic.

BUG=b:139326716, b:140608418
TEST=Ran lab tests with IPv6-only client successfully accessing
     Internet while Stadia emulator simultaneously streaming IPv4.

Change-Id: I6d1458ac6b4ee9ed6bb0ea89e8b1905089af8c2b
Signed-off-by: Danny J. Mitzel <mitzel@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1804576
Reviewed-by: Kan Yan <kyan@chromium.org>
Commit-Queue: Kan Yan <kyan@chromium.org>
Tested-by: Kan Yan <kyan@chromium.org>
2 files changed