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

Source/devtools/front_end/ui/Tooltip.js

 // Copyright (c) 2015 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
  * @param {!Document} doc
  */
 WebInspector.Tooltip = function(doc)
 {
@@ skipping 114 matching lines @@
     new WebInspector.Tooltip(doc);
 }
 
 /**
  * @param {!Element} element
  * @param {!Element|string} tooltipContent
  * @param {string=} actionId
  */
 WebInspector.Tooltip.install = function(element, tooltipContent, actionId)
 {
-    if (typeof tooltipContent === "string" && tooltipContent === "")
+    if (typeof tooltipContent === "string" && tooltipContent === "") {
+        delete element[WebInspector.Tooltip._symbol];
         return;
+    }
     element[WebInspector.Tooltip._symbol] =  { content: tooltipContent, actionId: actionId };
 }
+
+Object.defineProperty(HTMLElement.prototype, "title", {
+    /**
+     * @return {!Element|string}
+     * @this {!Element}
+     */
+    get: function()
+    {
+        var tooltip = this[WebInspector.Tooltip._symbol];
+        return tooltip ? tooltip.content : "";
+    },
+
+    /**
+     * @param {!Element|string} x
+     * @this {!Element}
+     */
+    set: function(x)
+    {
+        WebInspector.Tooltip.install(this, x);
+    }
+});