[presubmit] Enable readability/namespace linter checking.

src/hydrogen-store-elimination.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_STORE_ELIMINATION_H_
 #define V8_HYDROGEN_STORE_ELIMINATION_H_
 
 #include "src/hydrogen.h"
 #include "src/hydrogen-alias-analysis.h"
 
@@ skipping 11 matching lines @@
  private:
   ZoneList<HStoreNamedField*> unobserved_;
   HAliasAnalyzer* aliasing_;
 
   void ProcessStore(HStoreNamedField* store);
   void ProcessLoad(HLoadNamedField* load);
   void ProcessInstr(HInstruction* instr, GVNFlagSet flags);
 };
 
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif