Fix variable shadowing warnings in UDPSocketWin on VS2015

Fix variable shadowing warnings in UDPSocketWin on VS2015

d:\src\cr3\src\net\udp\udp_socket_win.cc(330): error C2220: warning treated as error - no 'object' file generated
d:\src\cr3\src\net\udp\udp_socket_win.cc(330): warning C4457: declaration of 'address' hides function parameter
d:\src\cr3\src\net\udp\udp_socket_win.cc(319): note: see declaration of 'address'
d:\src\cr3\src\net\udp\udp_socket_win.cc(351): warning C4457: declaration of 'address' hides function parameter
d:\src\cr3\src\net\udp\udp_socket_win.cc(340): note: see declaration of 'address'

R=eroman@chromium.org
BUG=440500
Committed: https://crrev.com/3a1c346e8d17824ec8732333ac167206c5dad322
Cr-Commit-Position: refs/heads/master@{#313390}

[scottmg, 2015-01-27 21:16:26]

scottmg@chromium.org changed reviewers:
+ eroman@chromium.org

[eroman, 2015-01-27 21:46:45]

lgtm

[scottmg, 2015-01-27 21:57:48]

The CQ bit was checked by scottmg@chromium.org

[commit-bot: I haz the power, 2015-01-27 21:58:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/882733003/20001

[commit-bot: I haz the power, 2015-01-27 22:57:59]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-01-27 22:58:59]

Patchset 2 (id:??) landed as
https://crrev.com/3a1c346e8d17824ec8732333ac167206c5dad322
Cr-Commit-Position: refs/heads/master@{#313390}