Update from https://crrev.com/329939

base/threading/thread_local_storage.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_THREADING_THREAD_LOCAL_STORAGE_H_
 #define BASE_THREADING_THREAD_LOCAL_STORAGE_H_
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 
@@ skipping 80 matching lines @@
 
   // A key representing one value stored in TLS.
   // Initialize like
   //   ThreadLocalStorage::StaticSlot my_slot = TLS_INITIALIZER;
   // If you're not using a static variable, use the convenience class
   // ThreadLocalStorage::Slot (below) instead.
   struct BASE_EXPORT StaticSlot {
     // Set up the TLS slot.  Called by the constructor.
     // 'destructor' is a pointer to a function to perform per-thread cleanup of
     // this object.  If set to NULL, no cleanup is done for this TLS slot.
-    // Returns false on error.
-    bool Initialize(TLSDestructorFunc destructor);
+    void Initialize(TLSDestructorFunc destructor);
 
     // Free a previously allocated TLS 'slot'.
     // If a destructor was set for this slot, removes
     // the destructor so that remaining threads exiting
     // will not free data.
     void Free();
 
     // Get the thread-local value stored in slot 'slot'.
     // Values are guaranteed to initially be zero.
     void* Get() const;
@@ skipping 23 matching lines @@
     DISALLOW_COPY_AND_ASSIGN(Slot);
   };
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ThreadLocalStorage);
 };
 
 }  // namespace base
 
 #endif  // BASE_THREADING_THREAD_LOCAL_STORAGE_H_