Fix the serialization for values in std::unique_ptrs.

headless/public/internal/value_conversions.h

Index: headless/public/internal/value_conversions.h
diff --git a/headless/public/internal/value_conversions.h b/headless/public/internal/value_conversions.h
index 4a85a02a464e1d1202ec7e7d37c9895943c96c1e..78ac41fc4cb40aefff7a05d27f7da78ddf3ce094 100644
--- a/headless/public/internal/value_conversions.h
+++ b/headless/public/internal/value_conversions.h
@@ -67,7 +67,7 @@ std::unique_ptr<base::Value> ToValueImpl(const std::vector<T>& vector,
 template <typename T>
 std::unique_ptr<base::Value> ToValueImpl(const std::unique_ptr<T>& value,
                                          std::unique_ptr<T>*) {
-  return ToValue(value.get());
+  return ToValue(*value);
 }
 
 // FromValue specializations for basic types.