Remove PropTypes from ElementProperties (#21350)

Summary:
Related to #21342
Pull Request resolved: https://github.com/facebook/react-native/pull/21350

Differential Revision: D10081454

Pulled By: TheSavior

fbshipit-source-id: db27a1f23c643b7d6d73136254eff91625419583

Libraries/Inspector/ElementProperties.js

@@ -11,7 +11,6 @@
 'use strict';
 
 const BoxInspector = require('BoxInspector');
-const PropTypes = require('prop-types');
 const React = require('React');
 const StyleInspector = require('StyleInspector');
 const StyleSheet = require('StyleSheet');
@@ -24,29 +23,21 @@ const flattenStyle = require('flattenStyle');
 const mapWithSeparator = require('mapWithSeparator');
 const openFileInEditor = require('openFileInEditor');
 
-import type {DangerouslyImpreciseStyleProp} from 'StyleSheet';
+import type {ViewStyleProp} from 'StyleSheet';
 
-class ElementProperties extends React.Component<{
+type Props = $ReadOnly<{|
   hierarchy: Array<$FlowFixMe>,
-  style?: DangerouslyImpreciseStyleProp,
-  source?: {
+  style?: ?ViewStyleProp,
+  source?: ?{
     fileName?: string,
     lineNumber?: number,
   },
-}> {
-  static propTypes = {
-    hierarchy: PropTypes.array.isRequired,
-    style: PropTypes.oneOfType([
-      PropTypes.object,
-      PropTypes.array,
-      PropTypes.number,
-    ]),
-    source: PropTypes.shape({
-      fileName: PropTypes.string,
-      lineNumber: PropTypes.number,
-    }),
-  };
+  frame?: ?Object,
+  selection?: ?number,
+  setSelection?: (number) => mixed,
+|}>;
 
+class ElementProperties extends React.Component<Props> {
   render() {
     const style = flattenStyle(this.props.style);
     // $FlowFixMe found when converting React.createClass to ES6