title: I cannot set content_security_policy for my google earth packaged app
body: <p>I am trying to create a packaged app that uses google earth API.  However, while running the app, I get an error that says:</p>
  
  <pre><code>Refused to load the script 'https://www.google.com/jsapi' because it violates the following Content Security Policy directive: "default-src 'self' chrome-extension-resource:". Note that 'script-src' was not explicitly set, so 'default-src' is used as a fallback.
  </code></pre>
  
  <p>So I added a line in the manifest that says </p>
  
  <pre><code>"content_security_policy": "script-src 'self' https://www.google.com/jsapi; object-src 'self'",
  </code></pre>
  
  <p>However, now chrome complains and displays the following error:</p>
  
  <pre><code>There were warnings when trying to install this extension:
  'content_security_policy' is only allowed for extensions and legacy packaged apps, and this is a packaged app.
  </code></pre>