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It seems that web_contents may be destroyed during
RunArcExternalProtocolDialog (See TODO comment in the code).
See crashes in crbug.com/1136237

So rather than bind web_contents directly into OnArcHandled(), we use
render_process_host_id and routing_id to look it up at the end as was
happening in ShowFallbackEternalProtocolDialog() prior to
crrev.com/c/2423067.

Bug: 1136237
Change-Id: If0bc1287f9eedbf2b915cd97e049a19f379254ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2460067
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Auto-Submit: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815200}