[DevTools] Improve Device Mode icons.

third_party/WebKit/Source/devtools/front_end/screencast/ScreencastApp.js

 // Copyright 2014 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.
 
 /**
  * @constructor
  * @implements {WebInspector.App}
  * @implements {WebInspector.TargetManager.Observer}
  */
 WebInspector.ScreencastApp = function()
 {
     this._enabledSetting = WebInspector.settings.createSetting("screencastEnabled", true);
-    this._toggleButton = new WebInspector.ToolbarToggle(WebInspector.UIString("Toggle screencast"), "screencast-toolbar-item");
+    this._toggleButton = new WebInspector.ToolbarToggle(WebInspector.UIString("Toggle screencast"), "phone-toolbar-item");
     this._toggleButton.setToggled(this._enabledSetting.get());
     this._toggleButton.addEventListener("click", this._toggleButtonClicked, this);
     WebInspector.targetManager.observeTargets(this);
 };
 
 WebInspector.ScreencastApp.prototype = {
     /**
      * @override
      * @param {!Document} document
      * @param {function()} callback
@@ skipping 115 matching lines @@
 WebInspector.ScreencastAppProvider.prototype = {
     /**
      * @override
      * @return {!WebInspector.App}
      */
     createApp: function()
     {
         return WebInspector.ScreencastApp._instance();
     }
 };