Password input type causes memory leak

<!-- Note: if the issue is about documentation or the website, please file it at: https://github.com/reactjs/reactjs.org/issues/new --> **Do you want to request a *feature* or report a *bug*?** *Bug* **What is the current behavior?** An `<input type="password"/>` causes a memory leak. **If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem. Your bug will get fixed much faster if we can run your code and it doesn't have dependencies other than React. Paste the link to your JSFiddle (https://jsfiddle.net/Luktwrdm/) or CodeSandbox (https://codesandbox.io/s/new) example below:** You can recreate the behavior by visiting https://iericallen.github.io/test-react/ and following the steps listed. Please view our source code at: https://github.com/iericallen/test-react/tree/source **What is the expected behavior?** Unmounted components including `<input type="password" />` can be garbage collected after next re-rendering. **Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?** OS: macOS X Mojave 10.14.2 (18C54) Chrome: 72.0.3626.109 React: 16.8.3 ReactDOM: 16.8.3