[presubmit] Enable readability/namespace linter checking.

src/arm64/delayed-masm-arm64.h

 // Copyright 2013 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_ARM64_DELAYED_MASM_ARM64_H_
 #define V8_ARM64_DELAYED_MASM_ARM64_H_
 
 #include "src/lithium.h"
 
 namespace v8 {
@@ skipping 141 matching lines @@
   // Address where the pending instruction must be generated. It's only used to
   // check that nothing else has been generated since we set the pending
   // instruction.
   int pending_pc_;
   // If true, the scratch register has been acquired outside this class. The
   // scratch register can no longer be used for constants.
   bool scratch_register_acquired_;
 #endif
 };
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_ARM64_DELAYED_MASM_ARM64_H_