[presubmit] Enable readability/namespace linter checking.

src/arm64/macro-assembler-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_MACRO_ASSEMBLER_ARM64_H_
 #define V8_ARM64_MACRO_ASSEMBLER_ARM64_H_
 
 #include <vector>
 
 #include "src/arm64/assembler-arm64.h"
@@ skipping 2260 matching lines @@
   // A width of 5 (Rd_width) for the SMI register preclues the use of csp,
   // since kSPRegInternalCode is 63. However, csp should never hold a SMI or be
   // used in a patchable check. The Emit() method checks this.
   //
   // Note that the total size of the fields is restricted by the underlying
   // storage size handled by the BitField class, which is a uint32_t.
   class RegisterBits : public BitField<unsigned, 0, 5> {};
   class DeltaBits : public BitField<uint32_t, 5, 32-5> {};
 };
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #ifdef GENERATED_CODE_COVERAGE
 #error "Unsupported option"
 #define CODE_COVERAGE_STRINGIFY(x) #x
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 #endif  // V8_ARM64_MACRO_ASSEMBLER_ARM64_H_