Make it possible to use ThreadLocalStorage::Slot as a static without

net/base/dns_reloader.cc

Index: net/base/dns_reloader.cc
diff --git a/net/base/dns_reloader.cc b/net/base/dns_reloader.cc
index ff79388a50cf319249c4ef045e89d24a3c21fa1b..2254f9afbafb2e6eb1abadc0cdb0b21d1cc70c20 100644
--- a/net/base/dns_reloader.cc
+++ b/net/base/dns_reloader.cc
@@ -93,15 +93,14 @@ class DnsReloader : public net::NetworkChangeNotifier::DNSObserver {
   friend struct base::DefaultLazyInstanceTraits<DnsReloader>;
 
   // We use thread local storage to identify which ReloadState to interact with.
-  static base::ThreadLocalStorage::Slot tls_index_ ;
+  static base::ThreadLocalStorage::StaticSlot tls_index_;
 
   DISALLOW_COPY_AND_ASSIGN(DnsReloader);
 };
 
 // A TLS slot to the ReloadState for the current thread.
 // static
-base::ThreadLocalStorage::Slot DnsReloader::tls_index_(
-    base::LINKER_INITIALIZED);
+base::ThreadLocalStorage::StaticSlot DnsReloader::tls_index_ = TLS_INITIALIZER;
 
 base::LazyInstance<DnsReloader>::Leaky
     g_dns_reloader = LAZY_INSTANCE_INITIALIZER;