[presubmit] Enable readability/namespace linter checking.

src/log-utils.h

 // Copyright 2006-2009 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_LOG_UTILS_H_
 #define V8_LOG_UTILS_H_
 
 #include "src/allocation.h"
 #include "src/base/platform/mutex.h"
 #include "src/flags.h"
@@ skipping 116 matching lines @@
   // Buffer used for formatting log messages. This is a singleton buffer and
   // mutex_ should be acquired before using it.
   char* message_buffer_;
 
   Logger* logger_;
 
   friend class Logger;
 };
 
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_LOG_UTILS_H_