DevTools: only set title w/ shortcut via Tooltip manager API.

Source/devtools/front_end/ui/Toolbar.js

 /*
  * Copyright (C) 2009 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 911 matching lines @@
  * @param {string} text
  * @param {string=} title
  * @param {!WebInspector.Setting=} setting
  */
 WebInspector.ToolbarCheckbox = function(text, title, setting)
 {
     WebInspector.ToolbarItem.call(this, createCheckboxLabel(text));
     this.element.classList.add("checkbox");
     this.inputElement = this.element.checkboxElement;
     if (title)
-        WebInspector.Tooltip.install(this.element, title);
+        this.element.title = title;
     if (setting)
         WebInspector.SettingsUI.bindCheckbox(this.inputElement, setting);
 }
 
 WebInspector.ToolbarCheckbox.prototype = {
     /**
      * @return {boolean}
      */
     checked: function()
     {
@@ skipping 74 matching lines @@
             for (var i = 0; i < items.length; ++i) {
                 var item = items[i];
                 if (item)
                     this.appendToolbarItem(item);
             }
         }
     },
 
     __proto__: WebInspector.Toolbar.prototype
 }