[presubmit] Enable readability/namespace linter checking.

src/heap/objects-visiting-inl.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_OBJECTS_VISITING_INL_H_
 #define V8_OBJECTS_VISITING_INL_H_
 
 #include "src/heap/array-buffer-tracker.h"
 #include "src/heap/objects-visiting.h"
 #include "src/ic/ic-state.h"
@@ skipping 884 matching lines @@
       reinterpret_cast<Object**>(this->address() + kTypeFeedbackInfoOffset));
   StaticVisitor::VisitNextCodeLink(
       heap, reinterpret_cast<Object**>(this->address() + kNextCodeLinkOffset));
 
 
   RelocIterator it(this, mode_mask);
   for (; !it.done(); it.next()) {
     it.rinfo()->template Visit<StaticVisitor>(heap);
   }
 }
-}
-}  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_OBJECTS_VISITING_INL_H_