[CrOS IntantTethering] Remove UI modal on failed tether connection

Remove unhelpful UI modal that is displayed that just says "Configure
phone" which offers to connect to the phone again.  It doesn't seem
to be helpful.

Bug: 862794
Change-Id: I6637d9b9931f0ca1b38b6d57b9326a806dee923e
Reviewed-on: https://chromium-review.googlesource.com/c/1357529
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613186}

chrome/browser/resources/settings/internet_page/internet_page.js

@@ -617,10 +617,14 @@ Polymer({
         console.error(
             'networkingPrivate.startConnect error: ' + message +
             ' For: ' + properties.GUID);
+
+        // There is no configuration flow for Instant Tethering networks.
+        if (properties.Type != CrOnc.Type.TETHER) {
           this.showConfig_(
               true /* configAndConnect */, properties.Type, properties.GUID,
               name);
         }
+      }
     });
   },
 });