Load 'ReactFabric' only when it is required to render a Fabric component

Reviewed By: yungsters

Differential Revision: D7970603

fbshipit-source-id: 34676b9e174bc1e1141f4f435aa2c8e2b62cd5b9

Author: mdvacca

Libraries/ReactNative/renderApplication.js

@@ -12,8 +12,6 @@
 
 const AppContainer = require('AppContainer');
 const React = require('React');
-const ReactFabric = require('ReactFabric');
-const ReactNative = require('ReactNative');
 
 const invariant = require('fbjs/lib/invariant');
 
@@ -51,9 +49,9 @@ function renderApplication<Props: Object>(
   }
 
   if (fabric) {
-    ReactFabric.render(renderable, rootTag);
+    require('ReactFabric').render(renderable, rootTag);
   } else {
-    ReactNative.render(renderable, rootTag);
+    require('ReactNative').render(renderable, rootTag);
   }
 }