[DevTools] Show viewport size on resize by default, disable in device mode.

third_party/WebKit/Source/devtools/front_end/main/RenderingOptions.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 28 matching lines @@
     this.registerRequiredCSS("main/renderingOptions.css");
 
     /** @type {!Map.<string, !Element>} */
     this._settings = new Map();
 
     this._appendCheckbox(WebInspector.UIString("Enable paint flashing"), "setShowPaintRects");
     this._appendCheckbox(WebInspector.UIString("Show layer borders"), "setShowDebugBorders");
     this._appendCheckbox(WebInspector.UIString("Show FPS meter"), "setShowFPSCounter");
     var scrollingTitle = WebInspector.UIString("Shows areas of the page that slow down scrolling:\nTouch and mousewheel event listeners can delay scrolling.\nSome areas need to repaint their content when scrolled.");
     this._appendCheckbox(WebInspector.UIString("Show scrolling perf issues"), "setShowScrollBottleneckRects", scrollingTitle);
-    this._appendCheckbox(WebInspector.UIString("Show page size on resize"), "setShowViewportSizeOnResize");
 
     // CSS media.
     var mediaRow = this.contentElement.createChild("div", "media-row");
     var checkboxLabel = createCheckboxLabel(WebInspector.UIString("Emulate media"), false);
     this._mediaCheckbox = checkboxLabel.checkboxElement;
     this._mediaCheckbox.addEventListener("click", this._mediaToggled.bind(this), false);
     mediaRow.appendChild(checkboxLabel);
     this._mediaSelect = mediaRow.createChild("select", "chrome-select");
     this._mediaSelect.appendChild(new Option(WebInspector.UIString("print"), "print"));
     this._mediaSelect.appendChild(new Option(WebInspector.UIString("screen"), "screen"));
@@ skipping 98 matching lines @@
      * @param {!WebInspector.Context} context
      * @param {string} actionId
      * @return {boolean}
      */
     handleAction: function(context, actionId)
     {
         WebInspector.inspectorView.showViewInDrawer("rendering");
         return true;
     }
 }