[presubmit] Enable readability/namespace linter checking.

src/base/atomicops_internals_x86_gcc.cc

 // 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.
 
 // This module gets enough CPU information to optimize the
 // atomicops module on x86.
 
 #include <string.h>  // NOLINT(build/include)
 
 #include "src/base/atomicops.h"
@@ skipping 29 matching lines @@
 // Set the flags so that code will run correctly and conservatively, so even
 // if we haven't been initialized yet, we're probably single threaded, and our
 // default values should hopefully be pretty safe.
 struct AtomicOps_x86CPUFeatureStruct AtomicOps_Internalx86CPUFeatures = {
   false,          // bug can't exist before process spawns multiple threads
 #if !defined(__SSE2__)
   false,          // no SSE2
 #endif
 };
 
-} }  // namespace v8::base
+}  // namespace base
+}  // namespace v8
 
 namespace {
 
 // Initialize the AtomicOps_Internalx86CPUFeatures struct.
 void AtomicOps_Internalx86CPUFeaturesInit() {
   using v8::base::AtomicOps_Internalx86CPUFeatures;
 
   uint32_t eax = 0;
   uint32_t ebx = 0;
   uint32_t ecx = 0;
@@ skipping 45 matching lines @@
 
 
 // A global to get use initialized on startup via static initialization :/
 AtomicOpsx86Initializer g_initer;
 
 }  // namespace
 
 #endif  // if x86
 
 #endif  // ifdef V8_BASE_ATOMICOPS_INTERNALS_X86_GCC_H_