title: convertRect:toView doesn't return expected window coordinates
body: <p>Currently, I am trying to get the coordinates of a <code>UIWebView</code>.  This webView is the subview a viewController's view.  The viewController is contained inside of a <code>UINavigationController</code>.  The status bar and the navigation bar are both on screen.</p>
  
  <p>The orientation is portrait.  The view has been presented modally.</p>
  
  <p>With the height of status bar at 20 and the height of navigation bar at 44, I would expect the frame of the webView (in window coordinates) would have an origin at (0, 64) and a width of (320, 416).</p>
  
  <p>However, when I run this line</p>
  
  <pre><code>CGRect frame = [webView.superview convertRect:webView.frame toView:nil];
  </code></pre>
  
  <p>I get an origin of (0, 0) and a width of (320, 416).</p>
  
  <p>Any ideas what I need to do to get the correct origin I am expecting? Am I using this method incorrectly?  Or are my expectations wrong for some reason?</p>