title: WKWebView process terminates without sandbox entitlement
body: <p>I'm trying to build a simple MacOS app with a web view. I'm using <code>WKWebView</code> and for no obvious reason the <code>webViewWebContentProcessDidTerminate()</code> method is called immediately after the web view is initialized without the web view even trying to load anything. After hours of looking in the documentation and in issues online, I cannot figure out why this is happening and how to prevent it. The only thing suggested online was to reload the web view when this happens which results in the method getting called again a moment later and so on endlessly. I'm now down to a completely empty MacOS app with the following source code:</p>
  
  <pre><code>class AppDelegate: NSObject, NSApplicationDelegate {
  
      @IBOutlet weak var window: NSWindow!
      var webView: WKWebView!
  
      func applicationDidFinishLaunching(_ aNotification: Notification) {
          webView = WKWebView(frame: .zero, configuration: WKWebViewConfiguration())
          webView.navigationDelegate = self
      }
  }
  
  extension AppDelegate: WKNavigationDelegate {
      func webViewWebContentProcessDidTerminate(_ webView: WKWebView) {
          print("web view process did terminate")
          webView.reload()
      }
  }
  </code></pre>
  
  <p>It doesn't matter if the web view is in the view hierarchy, has a non-zero frame and generally if it is visible or not. I've also enabled arbitrary loads just for the sake of trying out everything.</p>
  
  <p>I would really appreciate some help on this. I'm compiling against 10.13 SDK and running on a MacOS 10.12. </p>
  
  <p>Thanks.</p>