Disable ESLint's no-extend-native for two lines - #9625

src/renderers/dom/shared/__tests__/ReactDOMComponent-test.js
  819:11  warning  Object prototype is read only, properties should not be added  no-extend-native
  828:11  warning  Object prototype is read only, properties should not be added  no-extend-native

Object.prototype.toString = function() { // eslint-disable-line no-extend-native
  ...
}

Object.prototype.toString = function() {
  // eslint-disable-line no-extend-native
  ...
}

let  wrappedToString = function() {
  ...
}
Object.prototype.toString = wrappedToString; // eslint-disable-line no-extend-native