Ensure Freed TLS Slots Contain nullptr on Reallocation

base/threading/thread_local_storage.h

Index: base/threading/thread_local_storage.h
diff --git a/base/threading/thread_local_storage.h b/base/threading/thread_local_storage.h
index bc956a73bc058f51498ef733a4bc45aecbd53e9b..2444ac9efdc08318b26e5f6736e60d61491ffed1 100644
--- a/base/threading/thread_local_storage.h
+++ b/base/threading/thread_local_storage.h
@@ -5,6 +5,8 @@
 #ifndef BASE_THREADING_THREAD_LOCAL_STORAGE_H_
 #define BASE_THREADING_THREAD_LOCAL_STORAGE_H_
 
+#include <stdint.h>
+
 #include "base/atomicops.h"
 #include "base/base_export.h"
 #include "base/macros.h"
@@ -123,6 +125,7 @@ class BASE_EXPORT ThreadLocalStorage {
     // The internals of this struct should be considered private.
     base::subtle::Atomic32 initialized_;
     int slot_;
+    uint32_t version_;
   };
 
   // A convenience wrapper around StaticSlot with a constructor. Can be used