Remove performWithPriority from scheduler (facebook#10638)

Author: clemmy

src/renderers/noop/ReactNoopEntry.js

@@ -25,7 +25,6 @@ import type {UpdateQueue} from 'ReactFiberUpdateQueue';
 var ReactFiberInstrumentation = require('ReactFiberInstrumentation');
 var ReactFiberReconciler = require('ReactFiberReconciler');
 var ReactInstanceMap = require('ReactInstanceMap');
-var {TaskPriority} = require('ReactPriorityLevel');
 var emptyObject = require('fbjs/lib/emptyObject');
 
 var expect = require('jest-matchers');
@@ -351,10 +350,6 @@ var ReactNoop = {
     return !!scheduledCallback;
   },
 
-  taskUpdates(fn: Function) {
-    NoopRenderer.performWithPriority(TaskPriority, fn);
-  },
-
   batchedUpdates: NoopRenderer.batchedUpdates,
 
   deferredUpdates: NoopRenderer.deferredUpdates,

src/renderers/shared/fiber/ReactFiberReconciler.js

@@ -14,7 +14,6 @@
 
 import type {Fiber} from 'ReactFiber';
 import type {FiberRoot} from 'ReactFiberRoot';
-import type {PriorityLevel} from 'ReactPriorityLevel';
 import type {ReactNodeList} from 'ReactTypes';
 
 var ReactFeatureFlags = require('ReactFeatureFlags');
@@ -163,7 +162,6 @@ export type Reconciler<C, I, TI> = {
     parentComponent: ?React$Component<any, any>,
     callback: ?Function,
   ): void,
-  performWithPriority(priorityLevel: PriorityLevel, fn: Function): void,
   batchedUpdates<A>(fn: () => A): A,
   unbatchedUpdates<A>(fn: () => A): A,
   flushSync<A>(fn: () => A): A,
@@ -196,7 +194,6 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
   var {
     scheduleUpdate,
     getPriorityContext,
-    performWithPriority,
     batchedUpdates,
     unbatchedUpdates,
     flushSync,
@@ -284,8 +281,6 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
       scheduleTopLevelUpdate(current, element, callback);
     },
 
-    performWithPriority,
-
     batchedUpdates,
 
     unbatchedUpdates,

src/renderers/shared/fiber/ReactFiberScheduler.js

@@ -1501,16 +1501,6 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
     scheduleUpdateImpl(fiber, TaskPriority, true);
   }
 
-  function performWithPriority(priorityLevel: PriorityLevel, fn: Function) {
-    const previousPriorityContext = priorityContext;
-    priorityContext = priorityLevel;
-    try {
-      fn();
-    } finally {
-      priorityContext = previousPriorityContext;
-    }
-  }
-
   function batchedUpdates<A, R>(fn: (a: A) => R, a: A): R {
     const previousIsBatchingUpdates = isBatchingUpdates;
     isBatchingUpdates = true;
@@ -1573,7 +1563,6 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
   return {
     scheduleUpdate: scheduleUpdate,
     getPriorityContext: getPriorityContext,
-    performWithPriority: performWithPriority,
     batchedUpdates: batchedUpdates,
     unbatchedUpdates: unbatchedUpdates,
     flushSync: flushSync,