[presubmit] Enable readability/namespace linter checking.

src/ic/ic-compiler.h

 // Copyright 2014 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_IC_IC_COMPILER_H_
 #define V8_IC_IC_COMPILER_H_
 
 #include "src/ic/access-compiler.h"
 
 namespace v8 {
@@ skipping 107 matching lines @@
       return code->ic_state() == MONOMORPHIC
                  ? Logger::KEYED_STORE_IC_TAG
                  : Logger::KEYED_STORE_POLYMORPHIC_IC_TAG;
     }
   }
 
   const ExtraICState extra_ic_state_;
 };
 
 
-}
-}  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_IC_IC_COMPILER_H_