Deleted OS_WIN and all Windows specific files from base.

base/threading/thread_local_storage.cc

Index: base/threading/thread_local_storage.cc
diff --git a/base/threading/thread_local_storage.cc b/base/threading/thread_local_storage.cc
index 0bb396cfd7966fbe493b43683f4bb59a5561c9ce..48a4417d21eb6c29ade3345c9b13bd16aaf9fb98 100644
--- a/base/threading/thread_local_storage.cc
+++ b/base/threading/thread_local_storage.cc
@@ -171,23 +171,11 @@ namespace base {
 
 namespace internal {
 
-#if defined(OS_WIN)
-void PlatformThreadLocalStorage::OnThreadExit() {
-  PlatformThreadLocalStorage::TLSKey key =
-      base::subtle::NoBarrier_Load(&g_native_tls_key);
-  if (key == PlatformThreadLocalStorage::TLS_KEY_OUT_OF_INDEXES)
-    return;
-  void *tls_data = GetTLSValue(key);
-  // Maybe we have never initialized TLS for this thread.
-  if (!tls_data)
-    return;
-  OnThreadExitInternal(tls_data);
-}
-#elif defined(OS_POSIX)
+#if defined(OS_POSIX)
 void PlatformThreadLocalStorage::OnThreadExit(void* value) {
   OnThreadExitInternal(value);
 }
-#endif  // defined(OS_WIN)
+#endif  // defined(OS_POSIX)
 
 }  // namespace internal