base: Add/Fix namespace closing comments.

base/atomicops_internals_mac.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.
 
 // This file is an internal atomic implementation, use base/atomicops.h instead.
 
 #ifndef BASE_ATOMICOPS_INTERNALS_MAC_H_
 #define BASE_ATOMICOPS_INTERNALS_MAC_H_
 
 #include <libkern/OSAtomic.h>
@@ skipping 173 matching lines @@
   return value;
 }
 
 inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
   MemoryBarrier();
   return *ptr;
 }
 
 #endif  // defined(__LP64__)
 
-}   // namespace base::subtle
-}   // namespace base
+}  // namespace subtle
+}  // namespace base
 
 #endif  // BASE_ATOMICOPS_INTERNALS_MAC_H_