[presubmit] Enable readability/namespace linter checking.

src/profiler/cpu-profiler.h

 // Copyright 2012 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_CPU_PROFILER_H_
 #define V8_PROFILER_CPU_PROFILER_H_
 
 #include "src/allocation.h"
 #include "src/base/atomicops.h"
 #include "src/base/platform/time.h"
@@ skipping 252 matching lines @@
   base::TimeDelta sampling_interval_;
   CpuProfilesCollection* profiles_;
   ProfileGenerator* generator_;
   ProfilerEventsProcessor* processor_;
   bool saved_is_logging_;
   bool is_profiling_;
 
   DISALLOW_COPY_AND_ASSIGN(CpuProfiler);
 };
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 
 #endif  // V8_PROFILER_CPU_PROFILER_H_