Remove SafeAreaView flow declaration

Summary: Changelog: [Internal] Remove flow declaration for SafeAreaView in preparation for TS generation

Reviewed By: christophpurrer

Differential Revision: D42349686

fbshipit-source-id: b792313b18f3804d8c68955afd918ec8cbb0b80f

Author: lunaleaps

Libraries/Components/SafeAreaView/SafeAreaView.flow.js

@@ -9,7 +9,6 @@
  */
 
 import type {ViewProps} from '../View/ViewPropTypes';
-import type {SafeAreaViewType} from './SafeAreaView.flow';
 
 import Platform from '../../Utilities/Platform';
 import View from '../View/View';
@@ -32,4 +31,4 @@ if (Platform.OS === 'android') {
   exported = require('./RCTSafeAreaViewNativeComponent').default;
 }
 
-export default (exported: SafeAreaViewType);
+export default exported;