Upgrade fbsource/xplat/js to Flow v0.53.0

Reviewed By: avikchaudhuri

Differential Revision:
D5648819
Ninja: T20988071

fbshipit-source-id: 66e5b6747c79ae66b6eb69d40ede5e982c26174f

IntegrationTests/IntegrationTestHarnessTest.js

@@ -21,12 +21,10 @@ var {
 } = ReactNative;
 var { TestModule } = ReactNative.NativeModules;
 
-class IntegrationTestHarnessTest extends React.Component {
-  props: {
-    shouldThrow?: boolean,
-    waitOneFrame?: boolean,
-  };
-
+class IntegrationTestHarnessTest extends React.Component<{
+  shouldThrow?: boolean,
+  waitOneFrame?: boolean,
+}, $FlowFixMeState> {
   static propTypes = {
     shouldThrow: PropTypes.bool,
     waitOneFrame: PropTypes.bool,