Fix lint warnings due to backouts

Author: zpao

src/renderers/dom/shared/__tests__/ReactDOMComponent-test.js

@@ -17,14 +17,12 @@ describe('ReactDOMComponent', function() {
   var React;
 
   var ReactDOM;
-  var ReactDOMFeatureFlags;
   var ReactDOMServer;
 
   beforeEach(function() {
     jest.resetModuleRegistry();
     React = require('React');
     ReactDOM = require('ReactDOM');
-    ReactDOMFeatureFlags = require('ReactDOMFeatureFlags');
     ReactDOMServer = require('ReactDOMServer');
   });
 

src/renderers/dom/shared/devtools/ReactDOMUnknownPropertyDevtool.js

@@ -82,6 +82,6 @@ var ReactDOMUnknownPropertyDevtool = {
   onDeleteValueForProperty(node, name) {
     warnUnknownProperty(name);
   },
-}
+};
 
 module.exports = ReactDOMUnknownPropertyDevtool;