Fabric: Removing MainQueueExecutor

Summary: We don't need it anymore because we don't use folly::Future.

Reviewed By: JoshuaGross

Differential Revision: D15344961

fbshipit-source-id: a368e600d69e6879f6a98b4a997de85c71186e92

React/Fabric/Mounting/ComponentViews/Image/RCTImageComponentView.mm

@@ -15,7 +15,6 @@
 #import <react/imagemanager/ImageRequest.h>
 #import <react/imagemanager/RCTImagePrimitivesConversions.h>
 
-#import "MainQueueExecutor.h"
 #import "RCTConversions.h"
 
 @implementation RCTImageComponentView {

React/Fabric/Mounting/ComponentViews/Slider/RCTSliderComponentView.mm

@@ -13,8 +13,6 @@
 #import <react/components/slider/SliderComponentDescriptor.h>
 #import <react/components/slider/SliderLocalData.h>
 
-#import "MainQueueExecutor.h"
-
 using namespace facebook::react;
 
 @implementation RCTSliderComponentView {

React/Fabric/Utils/MainQueueExecutor.h

@@ -1,21 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-#include <folly/Executor.h>
-
-namespace facebook {
-namespace react {
-
-class MainQueueExecutor : public folly::Executor {
- public:
-  static MainQueueExecutor &instance();
-
-  void add(folly::Func function) override;
-};
-
-} // namespace react
-} // namespace facebook

React/Fabric/Utils/MainQueueExecutor.mm

@@ -1,31 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-#include "MainQueueExecutor.h"
-
-#include <dispatch/dispatch.h>
-#include <folly/Indestructible.h>
-
-namespace facebook {
-namespace react {
-
-MainQueueExecutor &MainQueueExecutor::instance()
-{
-  static auto instance = folly::Indestructible<MainQueueExecutor>{};
-  return *instance;
-}
-
-void MainQueueExecutor::add(folly::Func function)
-{
-  __block folly::Func blockFunction = std::move(function);
-  dispatch_async(dispatch_get_main_queue(), ^{
-    blockFunction();
-  });
-}
-
-} // namespace react
-} // namespace facebook