[presubmit] Enable readability/namespace linter checking.

src/ic/handler-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_HANDLER_COMPILER_H_
 #define V8_IC_HANDLER_COMPILER_H_
 
 #include "src/ic/access-compiler.h"
 #include "src/ic/ic-state.h"
 
@@ skipping 279 matching lines @@
                                 kCacheOnReceiver) {}
 
   virtual ~ElementHandlerCompiler() {}
 
   void CompileElementHandlers(MapHandleList* receiver_maps,
                               CodeHandleList* handlers,
                               LanguageMode language_mode);
 
   static void GenerateStoreSlow(MacroAssembler* masm);
 };
-}
-}  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_IC_HANDLER_COMPILER_H_