[presubmit] Enable readability/namespace linter checking.

src/heap/store-buffer-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_STORE_BUFFER_INL_H_
 #define V8_STORE_BUFFER_INL_H_
 
 #include "src/heap/heap.h"
 #include "src/heap/spaces-inl.h"
 #include "src/heap/store-buffer.h"
@@ skipping 30 matching lines @@
     old_top_ = top;
     old_buffer_is_sorted_ = false;
     old_buffer_is_filtered_ = false;
     if (top >= old_limit_) {
       DCHECK(callback_ != NULL);
       (*callback_)(heap_, MemoryChunk::FromAnyPointerAddress(heap_, addr),
                    kStoreBufferFullEvent);
     }
   }
 }
-}
-}  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_STORE_BUFFER_INL_H_