Land Recent QUIC Changes.

Land Recent QUIC Changes.

Add the override annotation to all necessary methods in .../quic/.

Merge internal change: 59008686
https://codereview.chromium.org/126243002/

Enabled StopPacketProcessing unit test.
Added EXPECT_CALL for OnUnauthenticatedPublicHeader.

R=rch@chromium.org
BUG=331630
https://codereview.chromium.org/113073003/


Add an end-to-end test which verifies that QUIC 13 does not generate
QUIC_STREAM_RST_BEFORE_HEADERS_DECOMPRESSED errors.

Merge internal change: 58990354
https://codereview.chromium.org/121883003/

Fix a bug in QuicSentPacketManager::ClearPreviousRetransmissions where
the high water mark is not raised past the current transmission of a
packet whose previous packet has been ACKed.  This bug was first
observer in jri's lab experiments.

Fix QUIC bug related to ACKs of previous transmission of packets.

Merge internal change: 58760014
https://codereview.chromium.org/125183004/


Correctly handle NACK-based "retransmission" of packets which no longer
have retransmittable data associated with this.  These can be the result
of TLP retransmission or a current transmission of a packet whose
previous transmission have been acked.

Fix QUIC bug related to ACKs of previous transmission of packets.

Merge internal change: 58758718
https://codereview.chromium.org/125183003/


Simplify RTO interaction between the QUIC sent packet manager and the
send algorithm.  The manager no longer needs to abandon each packet
individually.

Merge internal change: 58755766
https://codereview.chromium.org/125253004/


Remove a QUIC test only flag(limit_rto_increase_for_tests) to limit the
RTO increase in EndToEndTests.

This is no longer necessary now that two TLP's and early retransmit have
been added.

Merge internal change: 58591658
https://codereview.chromium.org/112953003/