[presubmit] Enable readability/namespace linter checking.

src/ast-expression-visitor.cc

 // Copyright 2015 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.
 
 #include "src/v8.h"
 
 #include "src/ast-expression-visitor.h"
 
 #include "src/ast.h"
 #include "src/codegen.h"
@@ skipping 332 matching lines @@
 
 
 void AstExpressionVisitor::VisitEmptyParentheses(EmptyParentheses* expr) {}
 
 
 void AstExpressionVisitor::VisitSuperPropertyReference(
     SuperPropertyReference* expr) {}
 
 
 void AstExpressionVisitor::VisitSuperCallReference(SuperCallReference* expr) {}
-}
 
 
-}  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8