[presubmit] Enable readability/namespace linter checking.

src/base/atomicops.h

 // Copyright 2010 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.
 
 // The routines exported by this module are subtle.  If you use them, even if
 // you get the code right, it will depend on careful reasoning about atomicity
 // and memory ordering; it will be less readable, and harder to maintain.  If
 // you plan to use these routines, you should have a good reason, such as solid
 // evidence that performance would otherwise suffer, or there being no
 // alternative.  You should assume only properties explicitly guaranteed by the
@@ skipping 115 matching lines @@
                                 Atomic64 old_value,
                                 Atomic64 new_value);
 void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value);
 void Acquire_Store(volatile Atomic64* ptr, Atomic64 value);
 void Release_Store(volatile Atomic64* ptr, Atomic64 value);
 Atomic64 NoBarrier_Load(volatile const Atomic64* ptr);
 Atomic64 Acquire_Load(volatile const Atomic64* ptr);
 Atomic64 Release_Load(volatile const Atomic64* ptr);
 #endif  // V8_HOST_ARCH_64_BIT
 
-} }  // namespace v8::base
+}  // namespace base
+}  // namespace v8
 
 // Include our platform specific implementation.
 #if defined(THREAD_SANITIZER)
 #include "src/base/atomicops_internals_tsan.h"
 #elif defined(_MSC_VER) && (V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64)
 #include "src/base/atomicops_internals_x86_msvc.h"
 #elif defined(__APPLE__)
 #include "src/base/atomicops_internals_mac.h"
 #elif defined(__native_client__)
 #include "src/base/atomicops_internals_portable.h"
@@ skipping 13 matching lines @@
 #error "Atomic operations are not supported on your platform"
 #endif
 
 // On some platforms we need additional declarations to make
 // AtomicWord compatible with our other Atomic* types.
 #if defined(__APPLE__) || defined(__OpenBSD__) || defined(V8_OS_AIX)
 #include "src/base/atomicops_internals_atomicword_compat.h"
 #endif
 
 #endif  // V8_BASE_ATOMICOPS_H_