Remove PropTypes from InspectorOverlay (facebook#21345)

Summary:
Related to facebook#21342
Pull Request resolved: facebook#21345

Differential Revision: D10081976

Pulled By: TheSavior

fbshipit-source-id: d6a905704fc5c2f10a6a8552f04e9c3feaeb147b

Libraries/Inspector/InspectorOverlay.js

@@ -12,33 +12,29 @@
 
 const Dimensions = require('Dimensions');
 const ElementBox = require('ElementBox');
-const PropTypes = require('prop-types');
 const React = require('React');
 const StyleSheet = require('StyleSheet');
 const UIManager = require('UIManager');
 const View = require('View');
 
+import type {ViewStyleProp} from 'StyleSheet';
+
 type EventLike = {
   nativeEvent: Object,
 };
 
-class InspectorOverlay extends React.Component<{
-  inspected?: {
-    frame?: Object,
-    style?: any,
-  },
-  inspectedViewTag?: number,
-  onTouchViewTag: (tag: number, frame: Object, pointerY: number) => void,
-}> {
-  static propTypes = {
-    inspected: PropTypes.shape({
-      frame: PropTypes.object,
-      style: PropTypes.any,
-    }),
-    inspectedViewTag: PropTypes.number,
-    onTouchViewTag: PropTypes.func.isRequired,
-  };
+type Inspected = $ReadOnly<{|
+  frame?: Object,
+  style?: ViewStyleProp,
+|}>;
+
+type Props = $ReadOnly<{|
+  inspected?: Inspected,
+  inspectedViewTag?: ?number,
+  onTouchViewTag: (tag: number, frame: Object, pointerY: number) => mixed,
+|}>;
 
+class InspectorOverlay extends React.Component<Props> {
   findViewForTouchEvent = (e: EventLike) => {
     const {locationX, locationY} = e.nativeEvent.touches[0];
     UIManager.findSubviewIn(