[presubmit] Enable readability/namespace linter checking.

src/interface-descriptors.cc

 // 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.
 
 #include "src/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
 
 namespace {
@@ skipping 11 matching lines @@
 Type* AnyTagged(Zone* zone) {
   return Type::Intersect(
       Type::Any(),
       Type::Union(Type::TaggedPointer(), Type::TaggedSigned(), zone), zone);
 }
 
 
 Type* ExternalPointer(Zone* zone) {
   return Type::Intersect(Type::Internal(), Type::UntaggedPointer(), zone);
 }
-}
+}  // namespace
 
 
 Type::FunctionType* CallInterfaceDescriptor::BuildDefaultFunctionType(
     Isolate* isolate, int parameter_count) {
   Zone* zone = isolate->interface_descriptor_zone();
   Type::FunctionType* function = Type::FunctionType::New(
       AnyTagged(zone), Type::Undefined(), parameter_count, zone);
   while (parameter_count-- != 0) {
     function->InitParameter(parameter_count, AnyTagged(zone));
   }
@@ skipping 469 matching lines @@
       Type::FunctionType::New(AnyTagged(zone), Type::Undefined(), 5, zone);
   function->InitParameter(0, Type::Receiver());
   function->InitParameter(1, SmiType(zone));
   function->InitParameter(2, AnyTagged(zone));
   function->InitParameter(3, AnyTagged(zone));
   function->InitParameter(4, AnyTagged(zone));
   return function;
 }
 }  // namespace internal
 }  // namespace v8