[presubmit] Enable readability/namespace linter checking.

src/arm64/frames-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.
 
 #include "src/arm64/assembler-arm64.h"
 #include "src/arm64/constants-arm64.h"
 
 #ifndef V8_ARM64_FRAMES_ARM64_H_
 #define V8_ARM64_FRAMES_ARM64_H_
 
@@ skipping 45 matching lines @@
   static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
 
   // There are two words on the stack (saved fp and saved lr) between fp and
   // the arguments.
   static const int kLastParameterOffset = 2 * kPointerSize;
 
   static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
 };
 
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_ARM64_FRAMES_ARM64_H_