Fix ref and component return types

Summary:
These types aren't robust to changes in the React component type. When we refactor requireNativeComponent these will error. This change is forwards compatible.

Changelog:
[Internal] Improve internal type in DrawerLayoutAndroid

Reviewed By: JoshuaGross

Differential Revision: D17561194

fbshipit-source-id: 470289449b4d5b3148692f1945fb720e1e3972eb

Libraries/Components/DrawerAndroid/DrawerLayoutAndroid.android.js

@@ -170,7 +170,9 @@ class DrawerLayoutAndroid extends React.Component<Props, State> {
     drawerBackgroundColor: 'white',
   };
 
-  _nativeRef = React.createRef<AndroidDrawerLayoutNativeComponent>();
+  _nativeRef = React.createRef<
+    React.ElementRef<typeof AndroidDrawerLayoutNativeComponent>,
+  >();
 
   state: State = {statusBarBackgroundColor: null};