[presubmit] Enable readability/namespace linter checking.

src/base/utils/random-number-generator.h

 // Copyright 2013 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.
 
 #ifndef V8_BASE_UTILS_RANDOM_NUMBER_GENERATOR_H_
 #define V8_BASE_UTILS_RANDOM_NUMBER_GENERATOR_H_
 
 #include "src/base/macros.h"
 
 namespace v8 {
@@ skipping 76 matching lines @@
   static const int64_t kMultiplier = V8_2PART_UINT64_C(0x5, deece66d);
   static const int64_t kAddend = 0xb;
   static const int64_t kMask = V8_2PART_UINT64_C(0xffff, ffffffff);
 
   int Next(int bits) WARN_UNUSED_RESULT;
 
   int64_t initial_seed_;
   int64_t seed_;
 };
 
-} }  // namespace v8::base
+}  // namespace base
+}  // namespace v8
 
 #endif  // V8_BASE_UTILS_RANDOM_NUMBER_GENERATOR_H_