Clean up globals

Summary: This diff is some boyscouting on cleaning up our globals, and stop using them inconsistently icmw global or window

Reviewed By: aigoncharov

Differential Revision: D33171108

fbshipit-source-id: 400893e5f31523631a7ab6fda428524c751901f1

desktop/flipper-ui-browser/src/global.ts

@@ -17,8 +17,6 @@ declare global {
       debug: boolean;
     };
 
-    FlipperRenderHostInstance: RenderHost;
-
     flipperShowError?(error: string): void;
     flipperHideError?(): void;
   }

desktop/flipper-ui-browser/src/index.tsx

@@ -15,7 +15,7 @@ document.getElementById('root')!.innerText = 'flipper-ui-browser started';
 
 async function start() {
   // @ts-ignore
-  (global as any).electronRequire = function (path: string) {
+  electronRequire = function (path: string) {
     console.error(
       `[decapitate] Tried to electronRequire ${path}, this module is not available in the browser and will be stubbed`,
     );

desktop/flipper-ui-browser/src/initializeRenderHost.tsx

@@ -14,7 +14,7 @@ export function initializeRenderHost(
   flipperServer: FlipperServer,
   flipperServerConfig: FlipperServerConfig,
 ) {
-  window.FlipperRenderHostInstance = {
+  FlipperRenderHostInstance = {
     readTextFromClipboard() {
       // TODO:
       return undefined;