DevTools: set a default color for icon masks

third_party/WebKit/Source/devtools/front_end/console/ConsoleViewMessage.js

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 294 matching lines @@
    * @param {!SDK.ConsoleMessage} consoleMessage
    * @param {!SDK.Target} target
    * @param {!Components.Linkifier} linkifier
    * @return {!Element}
    */
   _buildMessageWithStackTrace(consoleMessage, target, linkifier) {
     var toggleElement = createElementWithClass('div', 'console-message-stack-trace-toggle');
     var contentElement = toggleElement.createChild('div', 'console-message-stack-trace-wrapper');
 
     var messageElement = this._buildMessage(consoleMessage);
-    var icon = UI.Icon.create('smallicon-triangle-right', 'stack-trace-expand-icon');
+    var icon = UI.Icon.create('smallicon-triangle-right');
     var clickableElement = contentElement.createChild('div');
     clickableElement.appendChild(icon);
 
     clickableElement.appendChild(messageElement);
     var stackTraceElement = contentElement.createChild('div');
     var stackTracePreview =
         Components.DOMPresentationUtils.buildStackTracePreviewContents(target, linkifier, consoleMessage.stackTrace);
     stackTraceElement.appendChild(stackTracePreview);
     stackTraceElement.classList.add('hidden');
 
@@ skipping 881 matching lines @@
   toMessageElement() {
     if (!this._element) {
       super.toMessageElement();
       this._expandGroupIcon = UI.Icon.create('', 'expand-group-icon');
       this._contentElement.insertBefore(this._expandGroupIcon, this._contentElement.firstChild);
       this.setCollapsed(this._collapsed);
     }
     return this._element;
   }
 };