Remove permission warnings from most tabs and windows APIs.

chrome/common/extensions/api/tabs.json

 // Copyright (c) 2012 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.
 
 [
   {
     "namespace": "tabs",
     "dependencies": [ "extension", "windows" ],
     "types": [
       {
         "id": "Tab",
         "type": "object",
         "properties": {
           "id": {"type": "integer", "minimum": 0, "description": "The ID of the tab. Tab IDs are unique within a browser session."},
           "index": {"type": "integer", "minimum": 0, "description": "The zero-based index of the tab within its window."},
           "windowId": {"type": "integer", "minimum": 0, "description": "The ID of the window the tab is contained within."},
           "openerTabId": {"type": "integer", "minimum": 0, "optional": true, "description": "The ID of the tab that opened this tab, if any. This will only be present if the opener tab still exists."},
           "selected": {"type": "boolean", "description": "Whether the tab is selected.", "nodoc": true},
           "highlighted": {"type": "boolean", "description": "Whether the tab is highlighted."},
           "active": {"type": "boolean", "description": "Whether the tab is active in its window."},
           "pinned": {"type": "boolean", "description": "Whether the tab is pinned."},
-          "url": {"type": "string", "description": "The URL the tab is displaying."},
-          "title": {"type": "string", "optional": true, "description": "The title of the tab. This may not be available if the tab is loading."},
-          "favIconUrl": {"type": "string", "optional": true, "description": "The URL of the tab's favicon. This may not be available if the tab is loading."},
+          "url": {"type": "string", "optional": true, "description": "The URL the tab is displaying. This will only be present if the extension has the 'tabs' or 'webNavigation' permission."},
+          "title": {"type": "string", "optional": true, "optional": true, "description": "The title of the tab. This will only be present if the extension has the 'tabs' or 'webNavigation' permission. It may also be an empty string if the tab is loading."},
+          "favIconUrl": {"type": "string", "optional": true, "optional": true, "description": "The URL of the tab's favicon. This will only be present if the extension has the 'tabs' or 'webNavigation' permission. It may also be an empty string if the tab is loading."},
           "status": {"type": "string", "optional": true, "description": "Either <em>loading</em> or <em>complete</em>."},
           "incognito": {"type": "boolean", "description": "Whether the tab is in an incognito window."}
         }
       },
       {
         "id": "InjectDetails",
         "type": "object",
         "description": "Details of the script or CSS to inject. Either the code or the file property must be set, but both may not be set at the same time.",
         "properties": {
           "code": {"type": "string", "optional": true, "description": "JavaScript or CSS code to inject."},
@@ skipping 853 matching lines @@
             "name": "removeInfo",
             "properties": {
               "isWindowClosing": {"type": "boolean", "description": "True when the tab is being closed because its window is being closed." }
             }
           }
         ]
       }
     ]
   }
 ]