title: Google Sign-In crashes on iOS 9 attempting to call canOpenURL
body: <p>While testing Google Sign-In 2.1.0 on the iOS 9 SDK, invoking <code>GIDSignIn.sharedInstance().signInSilently()</code> ends up crashing on an internal Google Sign-In SDK call to <code>canOpenURL</code>.</p>
  
  <pre><code>-canOpenURL: failed for URL: "com.googleusercontent.apps.1234567890-abcdefghijklmnopqrstuvwxyz://a" - error: "This app is not allowed to query for scheme com.googleusercontent.apps.1234567890-abcdefghijklmnopqrstuvwxyz"
  *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Your app must support the following URL schemes: com.example.foo, com.googleusercontent.apps.1234567890-abcdefghijklmnopqrstuvwxyz'
  
  -canOpenURL: failed for URL: "com-google-gidconsent-google://" - error: "This app is not allowed to query for scheme com-google-gidconsent-google"
  -canOpenURL: failed for URL: "com-google-gidconsent-youtube://" - error: "This app is not allowed to query for scheme com-google-gidconsent-youtube"
  -canOpenURL: failed for URL: "com-google-gidconsent://" - error: "This app is not allowed to query for scheme com-google-gidconsent"
  -canOpenURL: failed for URL: "com.google.gppconsent.2.4.1://" - error: "This app is not allowed to query for scheme com.google.gppconsent.2.4.1"
  -canOpenURL: failed for URL: "com.google.gppconsent.2.4.0://" - error: "This app is not allowed to query for scheme com.google.gppconsent.2.4.0"
  -canOpenURL: failed for URL: "googlechrome:" - error: "This app is not allowed to query for scheme googlechrome"
  -canOpenURL: failed for URL: "googlechrome-x-callback:" - error: "This app is not allowed to query for scheme googlechrome-x-callback"
  -canOpenURL: failed for URL: "googlechrome-x-callback:" - error: "This app is not allowed to query for scheme googlechrome-x-callback"
  -canOpenURL: failed for URL: "googlechrome:" - error: "This app is not allowed to query for scheme googlechrome"
  </code></pre>