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