Rename header to titlebar

Summary: Changelog: [Internal] - Rename RNTesterHeader to RNTTitleBar

Reviewed By: kacieb

Differential Revision: D29571325

fbshipit-source-id: 192b73af63f2e924c8beb55e96855ebfe9afa6fb

packages/rn-tester/js/RNTesterAppShared.js

@@ -30,7 +30,7 @@ import {
 import {useAsyncStorageReducer} from './utils/useAsyncStorageReducer';
 import {RNTesterReducer, RNTesterActionsType} from './utils/RNTesterReducer';
 import {RNTesterThemeContext, themes} from './components/RNTesterTheme';
-import {Header} from './components/RNTesterHeader';
+import RNTTitleBar from './components/RNTTitleBar';
 import {RNTesterEmptyBookmarksState} from './components/RNTesterEmptyBookmarksState';
 
 const APP_STATE_KEY = 'RNTesterAppState.v3';
@@ -170,7 +170,7 @@ const RNTesterApp = (): React.Node => {
 
   return (
     <RNTesterThemeContext.Provider value={theme}>
-      <Header
+      <RNTTitleBar
         title={title}
         theme={theme}
         onBack={activeModule ? handleBackPress : null}

packages/rn-tester/js/components/RNTTitleBar.js

@@ -82,7 +82,7 @@ const HeaderAndroid = ({
   );
 };
 
-export const Header = ({
+export default function RNTTitleBar({
   onBack,
   title,
   documentationURL,
@@ -93,8 +93,8 @@ export const Header = ({
   documentationURL?: string,
   theme: RNTesterTheme,
   ...
-}): React.Node =>
-  Platform.OS === 'ios' ? (
+}): React.Node {
+  return Platform.OS === 'ios' ? (
     <HeaderIOS
       documentationURL={documentationURL}
       title={title}
@@ -108,6 +108,7 @@ export const Header = ({
       theme={theme}
     />
   );
+}
 
 const styles = StyleSheet.create({
   headerContainer: {