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The {OnQuicTransportHandshakeFailed} method uses {DispatchToAgents}
to send a console message to attached LogHandlers. There can
be potentially multiple LogHandlers, so passing a std::unique_ptr is
not possible. The first LogHandler receives a valid std::unique_ptr
but subsequent will only receive an empty one, causing a crash later
down the line.

This CL fixes the crash by passing a raw pointer and cloning the
log message before handing ownership over to the protocol.

R=sigurds@chromium.org

Bug: chromium:1069744, chromium:1084418
Change-Id: I6e1c2481b304481fb2b6c24e905f00562973af7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2207182
Commit-Queue: Simon Zünd <szuend@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770054}