[presubmit] Enable readability/namespace linter checking.

src/hydrogen-uint32-analysis.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_UINT32_ANALYSIS_H_
 #define V8_HYDROGEN_UINT32_ANALYSIS_H_
 
 #include "src/hydrogen.h"
 
 namespace v8 {
@@ skipping 13 matching lines @@
   INLINE(bool IsSafeUint32Use(HValue* val, HValue* use));
   INLINE(bool Uint32UsesAreSafe(HValue* uint32val));
   INLINE(bool CheckPhiOperands(HPhi* phi));
   INLINE(void UnmarkPhi(HPhi* phi, ZoneList<HPhi*>* worklist));
   INLINE(void UnmarkUnsafePhis());
 
   ZoneList<HPhi*> phis_;
 };
 
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_HYDROGEN_UINT32_ANALYSIS_H_