Remove custom handler based on PR feedback

packages/ember-runtime/lib/mixins/target_action_support.js

@@ -4,15 +4,13 @@
 */
 
 import { context } from 'ember-environment';
-import { registerHandler } from 'ember-debug/deprecate';
 import {
   get,
   Mixin,
   computed,
-  deprecate,
   descriptor
 } from 'ember-metal';
-import { assert } from 'ember-debug';
+import { assert, deprecate } from 'ember-debug';
 /**
 `Ember.TargetActionSupport` is a mixin that can be included in a class
 to add a `triggerAction` method with semantics similar to the Handlebars
@@ -150,12 +148,6 @@ function getTarget(instance) {
     }
   }
 
-  registerHandler(function(message, options, next) {
-    if (!options || options.id !== 'ember-runtime.using-targetObject') {
-      next(...arguments);
-    }
-  });
-  target = get(instance, 'targetObject');
   // if a `targetObject` CP was provided, use it
   if (target) { return target; }
 
@@ -167,6 +159,6 @@ function getTarget(instance) {
 
 function _deprecateTargetObject() {
   let message = 'Usage of `targetObject` is deprecated. Please use `target` instead.';
-  let options = { id: 'ember-runtime.using-targetObject', until: '2.12.0' };
+  let options = { id: 'ember-runtime.using-targetObject', until: '2.15.0' };
   deprecate(message, false, options);
 }