ScopedSimulateModifierKeyPress::~ScopedSimulateModifierKeyPress() {
  modifiers_ = SimulateModifierKeysUp(web_contents_, control_, shift_, alt_,
                                      command_, modifiers_);
  DCHECK_EQ(0, modifiers_);
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.