QUIC - clean up changes to keep internal source and chromium code in sync.

QUIC - clean up changes to keep internal source and chromium code in sync.

+ Comment update of quic_protocol.h.

Merge internal change: 98669107

QUIC - minor cleanup of code in QuicConnection::OnAckFrame to handle
incoming_ack.missing_packets.empty().

Fixed comments from internal CL: 98542855 (ian's review comments)

relnote: n/a (don't increment stop_waiting_count_ if
incoming_ack.missing_packets.empty and least_unacked > 0).

Merge internal change: 98543739

Minor clean up of client.set_initial_max_packet_length in
quic_client_bin and quic_simple_client_bin.

R=rch@chromium.org

Committed: https://crrev.com/bb2780cad4e11b3fdde2690428e90be003f5be73
Cr-Commit-Position: refs/heads/master@{#339928}

[Ryan Hamilton, 2015-07-22 18:06:49]

lgtm

[ramant (doing other things), 2015-07-22 18:08:45]

The CQ bit was checked by rtenneti@chromium.org

[commit-bot: I haz the power, 2015-07-22 18:09:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1245013003/20001

[commit-bot: I haz the power, 2015-07-22 19:16:14]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-07-22 19:17:43]

Patchset 2 (id:??) landed as
https://crrev.com/bb2780cad4e11b3fdde2690428e90be003f5be73
Cr-Commit-Position: refs/heads/master@{#339928}