[presubmit] Enable readability/namespace linter checking.

src/heap/store-buffer.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_H_
 #define V8_STORE_BUFFER_H_
 
 #include "src/allocation.h"
 #include "src/base/logging.h"
 #include "src/base/platform/platform.h"
@@ skipping 209 matching lines @@
   }
 
   ~DontMoveStoreBufferEntriesScope() {
     store_buffer_->may_move_store_buffer_entries_ = stored_state_;
   }
 
  private:
   StoreBuffer* store_buffer_;
   bool stored_state_;
 };
-}
-}  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_STORE_BUFFER_H_