[presubmit] Enable readability/namespace linter checking.

src/profiler/profile-generator.h

 // Copyright 2011 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_PROFILER_PROFILE_GENERATOR_H_
 #define V8_PROFILER_PROFILE_GENERATOR_H_
 
 #include <map>
 #include "include/v8-profiler.h"
 #include "src/allocation.h"
@@ skipping 365 matching lines @@
   CodeMap code_map_;
   CodeEntry* program_entry_;
   CodeEntry* idle_entry_;
   CodeEntry* gc_entry_;
   CodeEntry* unresolved_entry_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileGenerator);
 };
 
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_PROFILER_PROFILE_GENERATOR_H_