[presubmit] Enable readability/namespace linter checking.

src/hydrogen-alias-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_ALIAS_ANALYSIS_H_
 #define V8_HYDROGEN_ALIAS_ANALYSIS_H_
 
 #include "src/hydrogen.h"
 
 namespace v8 {
@@ skipping 50 matching lines @@
   inline bool MustAlias(HValue* a, HValue* b) {
     return Query(a, b) == kMustAlias;
   }
 
   inline bool NoAlias(HValue* a, HValue* b) {
     return Query(a, b) == kNoAlias;
   }
 };
 
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_HYDROGEN_ALIAS_ANALYSIS_H_