Rename internal fields

One day we'll use private fields for this but until then I'm just going to
rename these every version until people get the hint.

Author: sebmarkbage

packages/react-dom/src/client/ReactDOMComponentTree.js

@@ -18,9 +18,9 @@ import {getParentSuspenseInstance} from './ReactDOMHostConfig';
 const randomKey = Math.random()
   .toString(36)
   .slice(2);
-const internalInstanceKey = '__reactInternalInstance$' + randomKey;
-const internalEventHandlersKey = '__reactEventHandlers$' + randomKey;
-const internalContainerInstanceKey = '__reactContainere$' + randomKey;
+const internalInstanceKey = '__reactFiber$' + randomKey;
+const internalEventHandlersKey = '__reactEvents$' + randomKey;
+const internalContainerInstanceKey = '__reactContainer$' + randomKey;
 
 export function precacheFiberNode(hostInst, node) {
   node[internalInstanceKey] = hostInst;

packages/shared/ReactInstanceMap.js

@@ -21,17 +21,17 @@
  * supported we can rename it.
  */
 export function remove(key) {
-  key._reactInternalFiber = undefined;
+  key._reactInternals = undefined;
 }
 
 export function get(key) {
-  return key._reactInternalFiber;
+  return key._reactInternals;
 }
 
 export function has(key) {
-  return key._reactInternalFiber !== undefined;
+  return key._reactInternals !== undefined;
 }
 
 export function set(key, value) {
-  key._reactInternalFiber = value;
+  key._reactInternals = value;
 }