[presubmit] Enable readability/namespace linter checking.

src/type-feedback-vector-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_TYPE_FEEDBACK_VECTOR_INL_H_
 #define V8_TYPE_FEEDBACK_VECTOR_INL_H_
 
 #include "src/type-feedback-vector.h"
 
 namespace v8 {
@@ skipping 148 matching lines @@
 
 void FeedbackNexus::SetFeedbackExtra(Object* feedback_extra,
                                      WriteBarrierMode mode) {
   DCHECK(TypeFeedbackVector::elements_per_ic_slot() > 1);
   int index = vector()->GetIndex(slot()) + 1;
   vector()->set(index, feedback_extra, mode);
 }
 
 
 Isolate* FeedbackNexus::GetIsolate() const { return vector()->GetIsolate(); }
-}
-}  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_TYPE_FEEDBACK_VECTOR_INL_H_