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

Source/devtools/front_end/emulation/DevicesSettingsTab.js

 // Copyright 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
  * @extends {WebInspector.VBox}
  */
 WebInspector.DevicesSettingsTab = function()
 {
@@ skipping 78 matching lines @@
     {
         var item = createElementWithClass("div", "devices-list-item");
         var checkbox = item.createChild("input", "devices-list-checkbox");
         checkbox.type = "checkbox";
         checkbox.checked = device.show();
         item.createChild("div", "devices-list-title").textContent = device.title;
         item.addEventListener("click", onItemClicked.bind(this), false);
         item.classList.toggle("device-list-item-show", device.show());
         if (custom) {
             var editButton = item.createChild("div", "devices-list-edit");
-            WebInspector.Tooltip.install(editButton, WebInspector.UIString("Edit"));
+            editButton.title = WebInspector.UIString("Edit");
             editButton.addEventListener("click", onEditClicked.bind(this), false);
 
             var removeButton = item.createChild("div", "devices-list-remove");
-            WebInspector.Tooltip.install(removeButton, WebInspector.UIString("Remove"));
+            removeButton.title = WebInspector.UIString("Remove");
             removeButton.addEventListener("click", onRemoveClicked, false);
         }
 
         /**
          * @param {!Event} event
          * @this {WebInspector.DevicesSettingsTab}
          */
         function onItemClicked(event)
         {
             var show = !checkbox.checked;
@@ skipping 186 matching lines @@
         if (this._editDeviceListItem)
             this._editDeviceListItem.classList.remove("hidden");
         if (this._editDeviceElement.parentElement)
             this._devicesList.removeChild(this._editDeviceElement);
         this._addCustomButton.disabled = false;
         this._addCustomButton.focus();
     },
 
     __proto__: WebInspector.VBox.prototype
 }