[presubmit] Enable readability/namespace linter checking.

src/hydrogen-infer-representation.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_HYDROGEN_INFER_REPRESENTATION_H_
 #define V8_HYDROGEN_INFER_REPRESENTATION_H_
 
 #include "src/hydrogen.h"
 
 namespace v8 {
@@ skipping 11 matching lines @@
   void AddToWorklist(HValue* current);
 
  private:
   ZoneList<HValue*> worklist_;
   BitVector in_worklist_;
 
   DISALLOW_COPY_AND_ASSIGN(HInferRepresentationPhase);
 };
 
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_HYDROGEN_INFER_REPRESENTATION_H_