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Add the redirect URL port number to the redirect learning table.
Next CL will use the value of the port number for preconnect.

Change-Id: I1bd53ff9ab1486a5a6f3a36a51667bc36faf76b2
Bug: 983234
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1719832Reviewed-by: Alex Ilin <alexilin@chromium.org>
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681391}