Use spread instead of deprecated merge utility (#6634)

(cherry picked from commit 72ba5971ae)

src/renderers/native/ReactIOS/IOSNativeBridgeEventPlugin.js

@@ -15,7 +15,6 @@ var EventPropagators = require('EventPropagators');
 var SyntheticEvent = require('SyntheticEvent');
 var UIManager = require('UIManager');
 
-var merge = require('merge');
 var warning = require('warning');
 
 var customBubblingEventTypes = UIManager.customBubblingEventTypes;
@@ -38,7 +37,7 @@ for (var directTypeName in customDirectEventTypes) {
 
 var IOSNativeBridgeEventPlugin = {
 
-  eventTypes: merge(customBubblingEventTypes, customDirectEventTypes),
+  eventTypes: { ...customBubblingEventTypes, ...customDirectEventTypes },
 
   /**
    * @see {EventPluginHub.extractEvents}

src/renderers/native/ReactNative/ReactNativeEventEmitter.js

@@ -19,7 +19,6 @@ var ReactNativeTagHandles = require('ReactNativeTagHandles');
 var ReactUpdates = require('ReactUpdates');
 var EventConstants = require('EventConstants');
 
-var merge = require('merge');
 var warning = require('warning');
 
 var topLevelTypes = EventConstants.topLevelTypes;
@@ -91,7 +90,9 @@ var removeTouchesAtIndices = function(
  *
  * @internal
  */
-var ReactNativeEventEmitter = merge(ReactEventEmitterMixin, {
+var ReactNativeEventEmitter = {
+
+  ...ReactEventEmitterMixin,
 
   registrationNames: EventPluginRegistry.registrationNameModules,
 
@@ -218,6 +219,6 @@ var ReactNativeEventEmitter = merge(ReactEventEmitterMixin, {
       );
     }
   },
-});
+};
 
 module.exports = ReactNativeEventEmitter;

src/renderers/native/ReactNative/__mocks__/merge.js

@@ -1,18 +0,0 @@
-/**
- * Copyright 2013-2015, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- */
-
-'use strict';
-
-// TODO: Replace all callers with spread
-
-var merge = function(a, b) {
-  return {...a, ...b};
-};
-
-module.exports = merge;