Use getRenderHost from flipper-frontned-core in flipper-ui-core

Summary: See D37139129

Reviewed By: lblasa

Differential Revision: D37236435

fbshipit-source-id: 927e9f741bfedb65165f5d24f0acfb775925cdc7

desktop/flipper-ui-core/src/utils/runHealthchecks.tsx

@@ -12,7 +12,7 @@ import {
   reportPlatformFailures,
   FlipperDoctor,
 } from 'flipper-common';
-import {getRenderHostInstance} from '../RenderHost';
+import {getRenderHostInstance} from 'flipper-frontend-core';
 
 let healthcheckIsRunning: boolean;
 let runningHealthcheck: Promise<void>;