title: Chrome only error : Blocked a frame with origin "https://apis.google.com" from accessing
body: <p>I have followed the google+ api's <a href="https://developers.google.com/+/web/">guidelines</a> to put a signin button in my web app. It works with Firefox but not with Chrome : I get this same origin error :
  <code>Blocked a frame with origin "https://apis.google.com" from accessing a frame with origin "https://mysite.com".</code>
  And I have declared <code>https://mysite.com</code> as a "javascript" origin in the <a href="https://console.developers.google.com">https://console.developers.google.com</a>.</p>
  
  <p>I don't get it, it's their browser and thei api's doesn't work with it...
  Can you help me overcome this cross-domain problem with Chrome  ?</p>