Chrome Autofill overwrites values on controlled components

<!-- 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*?** Report a bug. Initially reported in https://github.com/mozilla-services/react-jsonschema-form/issues/1153 **What is the current behavior?** Autofill overwrites existing values in fields when those fields are controlled components in React. See https://jsfiddle.net/epicfaace/9p17e2qx/21/ -- to test this, add a "Saved Address" in the Chrome options.  **What is the expected behavior?** Autofill does not overwrite existing fields. I've made a JSFiddle with a plain HTML form, which works with the expected behavior. See https://jsfiddle.net/epicfaace/1my3f9n4/6/  **Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?** React 15.3.2 Chrome 71.0.3578.98