Remove Windows Vista/XP specific code from net/socket.

The socket code currently contains an option to cleanup idle socket after a small delay. This option is only used on Windows as a workaround for Windows XP. Now that Windows XP is no longer supported, this option can be removed.

BUG=580691

Review-Url: https://codereview.chromium.org/1982263003
Cr-Commit-Position: refs/heads/master@{#394886}
4 files changed