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

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

Index: third_party/WebKit/Source/devtools/front_end/sources/WatchExpressionsSidebarPane.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sources/WatchExpressionsSidebarPane.js b/third_party/WebKit/Source/devtools/front_end/sources/WatchExpressionsSidebarPane.js
index fd346033580c18eb6a0cd6ded0b9991a8bafb5d2..6385a2a01b5b3fb80f49921824044abd8f649456 100644
--- a/third_party/WebKit/Source/devtools/front_end/sources/WatchExpressionsSidebarPane.js
+++ b/third_party/WebKit/Source/devtools/front_end/sources/WatchExpressionsSidebarPane.js
@@ -43,9 +43,9 @@
     this._watchExpressionsSetting = Common.settings.createLocalSetting('watchExpressions', []);
 
     this._addButton = new UI.ToolbarButton(Common.UIString('Add expression'), 'largeicon-add');
-    this._addButton.addEventListener(UI.ToolbarButton.Events.Click, this._addButtonClicked.bind(this));
+    this._addButton.addEventListener('click', this._addButtonClicked.bind(this));
     this._refreshButton = new UI.ToolbarButton(Common.UIString('Refresh'), 'largeicon-refresh');
-    this._refreshButton.addEventListener(UI.ToolbarButton.Events.Click, this.update, this);
+    this._refreshButton.addEventListener('click', this._refreshButtonClicked.bind(this));
 
     this._bodyElement = this.element.createChild('div', 'vbox watch-expressions');
     this._bodyElement.addEventListener('contextmenu', this._contextMenu.bind(this), false);
@@ -82,9 +82,22 @@
     this._watchExpressionsSetting.set(toSave);
   }
 
-  _addButtonClicked() {
+  /**
+   * @param {!Common.Event=} event
+   */
+  _addButtonClicked(event) {
+    if (event)
+      event.consume(true);
     UI.viewManager.showView('sources.watch');
     this._createWatchExpression(null).startEditing();
+  }
+
+  /**
+   * @param {!Common.Event} event
+   */
+  _refreshButtonClicked(event) {
+    event.consume();
+    this.update();
   }
 
   /**