title: Chrome extension - GCM - Image not loading
body: <p>if I put my iconUrl as the following, it works:</p>
  
  <pre><code>iconUrl: 'assets/img/cat.jpg/',
  </code></pre>
  
  <p>However, if I put is as the following, it doesn't</p>
  
  <pre><code>iconUrl: 'assets/img/'+ message.data.imgUrl+'/',
  </code></pre>
  
  <p>I debugged to find the correct value present in message.data.imgUrl (cat.jpg). What am I doing incorrect?</p>