[presubmit] Enable readability/namespace linter checking.

src/lithium-inl.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_LITHIUM_INL_H_
 #define V8_LITHIUM_INL_H_
 
 #include "src/lithium.h"
 
 #if V8_TARGET_ARCH_IA32
@@ skipping 90 matching lines @@
   LOperand* result = input_iterator_.Done() ? env_iterator_.Current()
                                             : input_iterator_.Current();
   DCHECK(result != NULL);
   return result;
 }
 
 
 void UseIterator::Advance() {
   input_iterator_.Done() ? env_iterator_.Advance() : input_iterator_.Advance();
 }
-}
-}  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_LITHIUM_INL_H_