Revert of [DevTools] Remove methods on Common.Event.

third_party/WebKit/Source/devtools/front_end/profiler/HeapSnapshotProxy.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyrightdd
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 139 matching lines @@
     this._checkLongRunningCalls();
     this._interval = setInterval(this._checkLongRunningCalls.bind(this), 300);
   }
 
   _checkLongRunningCalls() {
     for (var callId of this._previousCallbacks) {
       if (!this._callbacks.has(callId))
         this._previousCallbacks.delete(callId);
     }
     var hasLongRunningCalls = !!this._previousCallbacks.size;
-    this.dispatchEventToListeners(Profiler.HeapSnapshotWorkerProxy.Events.Wait, hasLongRunningCalls);
+    this.dispatchEventToListeners('wait', hasLongRunningCalls);
     for (var callId of this._callbacks.keysArray())
       this._previousCallbacks.add(callId);
   }
 
   /**
    * @param {!MessageEvent} event
    */
   _messageReceived(event) {
     var data = event.data;
     if (data.eventName) {
@@ skipping 15 matching lines @@
     var callback = this._callbacks.get(data.callId);
     this._callbacks.delete(data.callId);
     callback(data.result);
   }
 
   _postMessage(message) {
     this._worker.postMessage(message);
   }
 };
 
-Profiler.HeapSnapshotWorkerProxy.Events = {
-  Wait: Symbol('Wait')
-};
-
 /**
  * @unrestricted
  */
 Profiler.HeapSnapshotProxyObject = class {
   /**
    * @param {!Profiler.HeapSnapshotWorkerProxy} worker
    * @param {number} objectId
    */
   constructor(worker, objectId) {
     this._worker = worker;
@@ skipping 336 matching lines @@
 
   /**
    * @override
    * @param {!Profiler.HeapSnapshotCommon.ComparatorConfig} comparator
    * @return {!Promise<?>}
    */
   sortAndRewind(comparator) {
     return this._callMethodPromise('sortAndRewind', comparator);
   }
 };