I am trying to set up permission for Chrome so it can ask for webRequest.
However, if I add the permission like in the manual here http://developer.chrome.com/extensions/webRequest.html
{
  "name": "My extension",
  ...
  "permissions": [
    "webRequest",
    "*://*.google.com"
  ],
  ...
}
All I get from Chrome is
There were warnings when trying to install this extension: Permission '://.google.com' is unknown or URL pattern is malformed.
Where is the error in the manual, what should I do differently?