[presubmit] Enable readability/namespace linter checking.

src/ic/ic-state.h

 // Copyright 2012 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_STATE_H_
 #define V8_IC_STATE_H_
 
 #include "src/macro-assembler.h"
 
 namespace v8 {
@@ skipping 250 matching lines @@
   STATIC_ASSERT(i::LANGUAGE_END == 3);
 
   // For convenience, a statically declared encoding of strict mode extra
   // IC state.
   static const ExtraICState kStrictModeState = STRICT
                                                << LanguageModeState::kShift;
 
  private:
   const ExtraICState state_;
 };
-}
-}
+
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_IC_STATE_H_