[presubmit] Enable readability/namespace linter checking.

src/lithium-allocator-inl.h

 // Copyright 2011 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_LITHIUM_ALLOCATOR_INL_H_
 #define V8_LITHIUM_ALLOCATOR_INL_H_
 
 #include "src/lithium-allocator.h"
 
 #if V8_TARGET_ARCH_IA32
@@ skipping 36 matching lines @@
   if (range->Kind() == DOUBLE_REGISTERS) {
     assigned_double_registers_->Add(reg);
   } else {
     DCHECK(range->Kind() == GENERAL_REGISTERS);
     assigned_registers_->Add(reg);
   }
   range->set_assigned_register(reg, chunk()->zone());
 }
 
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_LITHIUM_ALLOCATOR_INL_H_