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

third_party/WebKit/Source/devtools/front_end/components/Spectrum.js

Index: third_party/WebKit/Source/devtools/front_end/components/Spectrum.js
diff --git a/third_party/WebKit/Source/devtools/front_end/components/Spectrum.js b/third_party/WebKit/Source/devtools/front_end/components/Spectrum.js
index 3cc071974d7d5a44fd29699ee02ecf5e36b3607a..65286b4e5a462e99117c3510a62f4e8eb0bbc1a5 100644
--- a/third_party/WebKit/Source/devtools/front_end/components/Spectrum.js
+++ b/third_party/WebKit/Source/devtools/front_end/components/Spectrum.js
@@ -130,7 +130,7 @@
 
     this._addColorToolbar = new UI.Toolbar('add-color-toolbar');
     var addColorButton = new UI.ToolbarButton(Common.UIString('Add to palette'), 'largeicon-add');
-    addColorButton.addEventListener(UI.ToolbarButton.Events.Click, this._addColorToCustomPalette, this);
+    addColorButton.addEventListener('click', this._addColorToCustomPalette.bind(this));
     this._addColorToolbar.appendToolbarItem(addColorButton);
 
     this._loadPalettes();
@@ -193,7 +193,7 @@
     title.textContent = Common.UIString('Color Palettes');
     var toolbar = new UI.Toolbar('', this._palettePanel);
     var closeButton = new UI.ToolbarButton('Return to color picker', 'largeicon-delete');
-    closeButton.addEventListener(UI.ToolbarButton.Events.Click, this._togglePalettePanel.bind(this, false));
+    closeButton.addEventListener('click', this._togglePalettePanel.bind(this, false));
     toolbar.appendToolbarItem(closeButton);
     for (var palette of this._palettes.values())
       this._palettePanel.appendChild(this._createPreviewPaletteElement(palette));
@@ -509,10 +509,7 @@
         Components.Spectrum._ChangeSource.Other);
   }
 
-  /**
-   * @param {!Common.Event} event
-   */
-  _addColorToCustomPalette(event) {
+  _addColorToCustomPalette() {
     var palette = this._customPaletteSetting.get();
     palette.colors.push(this.colorString());
     this._customPaletteSetting.set(palette);