Fix variable shadowing in TLS code on VS2015

Fix variable shadowing in TLS code on VS2015

d:\src\cr3\src\base\threading\thread_local_storage.cc(143): error C2220: warning treated as error - no 'object' file generated
d:\src\cr3\src\base\threading\thread_local_storage.cc(143): warning C4457: declaration of 'value' hides function parameter
d:\src\cr3\src\base\threading\thread_local_storage.cc(110): note: see declaration of 'value'

R=thakis@chromium.org
BUG=440500
Committed: https://crrev.com/6c2204658de1f7ed8350c43d522c592272aaa821
Cr-Commit-Position: refs/heads/master@{#313342}

[scottmg, 2015-01-27 19:12:39]

scottmg@chromium.org changed reviewers:
+ thakis@chromium.org
- jam@chromium.org

[Nico, 2015-01-27 19:21:32]

lgtm

[scottmg, 2015-01-27 19:25:49]

The CQ bit was checked by scottmg@chromium.org

[commit-bot: I haz the power, 2015-01-27 19:26:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/880023002/1

[commit-bot: I haz the power, 2015-01-27 20:21:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-27 20:23:11]

Patchset 1 (id:??) landed as
https://crrev.com/6c2204658de1f7ed8350c43d522c592272aaa821
Cr-Commit-Position: refs/heads/master@{#313342}