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

third_party/WebKit/Source/devtools/front_end/sources/XHRBreakpointsSidebarPane.js

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
  * @implements {UI.ContextFlavorListener}
  * @implements {SDK.TargetManager.Observer}
  * @implements {UI.ToolbarItem.ItemsProvider}
  * @unrestricted
  */
 Sources.XHRBreakpointsSidebarPane = class extends Components.BreakpointsSidebarPaneBase {
   constructor() {
     super();
     this._xhrBreakpointsSetting = Common.settings.createLocalSetting('xhrBreakpoints', []);
 
     /** @type {!Map.<string, !Element>} */
     this._breakpointElements = new Map();
 
     this._addButton = new UI.ToolbarButton(Common.UIString('Add breakpoint'), 'largeicon-add');
-    this._addButton.addEventListener(UI.ToolbarButton.Events.Click, this._addButtonClicked.bind(this));
+    this._addButton.addEventListener('click', this._addButtonClicked.bind(this));
 
     this.emptyElement.addEventListener('contextmenu', this._emptyElementContextMenu.bind(this), true);
     SDK.targetManager.observeTargets(this, SDK.Target.Capability.Browser);
     this._update();
   }
 
   /**
    * @override
    * @param {!SDK.Target} target
    */
@@ skipping 15 matching lines @@
   toolbarItems() {
     return [this._addButton];
   }
 
   _emptyElementContextMenu(event) {
     var contextMenu = new UI.ContextMenu(event);
     contextMenu.appendItem(Common.UIString.capitalize('Add ^breakpoint'), this._addButtonClicked.bind(this));
     contextMenu.show();
   }
 
-  _addButtonClicked() {
+  _addButtonClicked(event) {
+    if (event)
+      event.consume();
+
     UI.viewManager.showView('sources.xhrBreakpoints');
 
     var inputElementContainer = createElementWithClass('p', 'breakpoint-condition');
     inputElementContainer.textContent = Common.UIString('Break when URL contains:');
 
     var inputElement = inputElementContainer.createChild('span', 'editing');
     inputElement.id = 'breakpoint-condition-input';
     this.addListElement(inputElementContainer, /** @type {?Element} */ (this.listElement.firstChild));
 
     /**
@@ skipping 179 matching lines @@
    */
   _restoreBreakpoints(target) {
     var breakpoints = this._xhrBreakpointsSetting.get();
     for (var i = 0; i < breakpoints.length; ++i) {
       var breakpoint = breakpoints[i];
       if (breakpoint && typeof breakpoint.url === 'string')
         this._setBreakpoint(breakpoint.url, breakpoint.enabled, target);
     }
   }
 };