[presubmit] Enable readability/namespace linter checking.

src/base/atomicops_internals_atomicword_compat.h

 // Copyright 2014 the V8 project 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 atomicops.h instead.
 
 #ifndef V8_BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
 #define V8_BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
 
 // AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32,
@@ skipping 74 matching lines @@
 inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) {
   return v8::base::Acquire_Load(
       reinterpret_cast<volatile const Atomic32*>(ptr));
 }
 
 inline AtomicWord Release_Load(volatile const AtomicWord* ptr) {
   return v8::base::Release_Load(
       reinterpret_cast<volatile const Atomic32*>(ptr));
 }
 
-} }  // namespace v8::base
+}  // namespace base
+}  // namespace v8
 
 #endif  // !defined(V8_HOST_ARCH_64_BIT)
 
 #endif  // V8_BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_