Remove TimerMixin from TouchableOpacity (facebook#21520)

Summary:
Related to facebook#21485
This PR removes TimerMixin from TouchableOpacity
Pull Request resolved: facebook#21520

Differential Revision: D10223753

Pulled By: RSNara

fbshipit-source-id: fc02077de7e73ee968b7944c0178892825099063

Libraries/Components/Touchable/TouchableOpacity.js

@@ -15,7 +15,6 @@ const Easing = require('Easing');
 const NativeMethodsMixin = require('NativeMethodsMixin');
 const React = require('React');
 const PropTypes = require('prop-types');
-const TimerMixin = require('react-timer-mixin');
 const Touchable = require('Touchable');
 const TouchableWithoutFeedback = require('TouchableWithoutFeedback');
 
@@ -132,7 +131,7 @@ type Props = $ReadOnly<{|
  */
 const TouchableOpacity = ((createReactClass({
  displayName: 'TouchableOpacity',
- mixins: [TimerMixin, Touchable.Mixin, NativeMethodsMixin],
+ mixins: [Touchable.Mixin, NativeMethodsMixin],
 
  propTypes: {
  ...TouchableWithoutFeedback.propTypes,