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
Review URL: https://codereview.chromium.org/
880023002
Cr-Commit-Position: refs/heads/master@{#313342}