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

Source/devtools/front_end/elements/StylesSidebarPane.js

 /*
  * Copyright (C) 2007 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
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 74 matching lines @@
 /**
  * @param {!WebInspector.CSSProperty} property
  * @return {!Element}
  */
 WebInspector.StylesSidebarPane.createExclamationMark = function(property)
 {
     var exclamationElement = createElement("label", "dt-icon-label");
     exclamationElement.className = "exclamation-mark";
     if (!WebInspector.StylesSidebarPane.ignoreErrorsForProperty(property))
         exclamationElement.type = "warning-icon";
-    WebInspector.Tooltip.install(exclamationElement, WebInspector.CSSMetadata.cssPropertiesMetainfo.keySet()[property.name.toLowerCase()] ? WebInspector.UIString("Invalid property value") : WebInspector.UIString("Unknown property name"));
+    exclamationElement.title = WebInspector.CSSMetadata.cssPropertiesMetainfo.keySet()[property.name.toLowerCase()] ? WebInspector.UIString("Invalid property value") : WebInspector.UIString("Unknown property name");
     return exclamationElement;
 }
 
 /**
  * @param {!WebInspector.CSSProperty} property
  * @return {boolean}
  */
 WebInspector.StylesSidebarPane.ignoreErrorsForProperty = function(property) {
     /**
      * @param {string} string
@@ skipping 883 matching lines @@
     selectorContainer.appendChild(openBrace);
     selectorContainer.addEventListener("mousedown", this._handleEmptySpaceMouseDown.bind(this), false);
     selectorContainer.addEventListener("click", this._handleSelectorContainerClick.bind(this), false);
 
     var closeBrace = createElement("div");
     closeBrace.textContent = "}";
     this.element.appendChild(closeBrace);
 
     if (this.editable && rule) {
         var newRuleButton = closeBrace.createChild("div", "sidebar-pane-button-new-rule");
-        WebInspector.Tooltip.install(newRuleButton, WebInspector.UIString("Insert Style Rule"));
+        newRuleButton.title = WebInspector.UIString("Insert Style Rule");
         newRuleButton.addEventListener("click", this._onNewRuleClick.bind(this), false);
     }
 
     this._selectorElement.addEventListener("click", this._handleSelectorClick.bind(this), false);
     this.element.addEventListener("mousedown", this._handleEmptySpaceMouseDown.bind(this), false);
     this.element.addEventListener("click", this._handleEmptySpaceClick.bind(this), false);
 
     if (rule) {
         // Prevent editing the user agent and user rules.
         if (rule.isUserAgent || rule.isInjected) {
@@ skipping 2231 matching lines @@
 
     /**
      * @override
      * @return {?WebInspector.ToolbarItem}
      */
     item: function()
     {
         return this._button;
     }
 }