[presubmit] Enable readability/namespace linter checking.

src/macro-assembler.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_MACRO_ASSEMBLER_H_
 #define V8_MACRO_ASSEMBLER_H_
 
 #include "src/assembler.h"
 
 
@@ skipping 260 matching lines @@
   static ExternalReference GetAllocationLimitReference(
       Isolate* isolate, AllocationFlags flags) {
     if ((flags & PRETENURE) != 0) {
       return ExternalReference::old_space_allocation_limit_address(isolate);
     }
     return ExternalReference::new_space_allocation_limit_address(isolate);
   }
 };
 
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_MACRO_ASSEMBLER_H_