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This change also resets socket_ to nullptr when the socket is closed.

Bug: 101492
Change-Id: Ic4942fc580815eb0c062a821ac340138ac98a24a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900569Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712928}