[UTS] Disable use of bestTransport / availableTransport private APIs

This is part of removing some common private API usage for the unified
test suite.

As mentioned in cfc66aa, client libraries running in unified test suite
are expected to only use WebSocket transport.

test/common/modules/shared_helper.js

@@ -121,25 +121,10 @@ define([
     }
 
     get availableTransports() {
-      const helper = this.addingHelperFunction('availableTransports');
-      return helper._availableTransports;
-    }
-
-    get _availableTransports() {
-      this.recordPrivateApi('call.Utils.keysArray');
-      this.recordPrivateApi('call.ConnectionManager.supportedTransports');
-      this.recordPrivateApi('read.Realtime._transports');
-      return utils.keysArray(
-        clientModule.Ably.Realtime.ConnectionManager.supportedTransports(clientModule.Ably.Realtime._transports),
-      );
+      return ['web_socket'];
     }
 
     get bestTransport() {
-      const helper = this.addingHelperFunction('bestTransport');
-      return helper._bestTransport;
-    }
-
-    get _bestTransport() {
       return this.availableTransports[0];
     }
 

test/realtime/init.test.js

@@ -403,7 +403,8 @@ define(['ably', 'shared_helper', 'chai'], function (Ably, Helper, chai) {
         try {
           realtime = helper.AblyRealtime({ transports: helper.availableTransports });
           helper.recordPrivateApi('read.connectionManager.baseTransport');
-          expect(realtime.connection.connectionManager.baseTransport).to.equal('comet');
+          // There’s no base transport now that we’re only specifiying web_socket
+          //expect(realtime.connection.connectionManager.baseTransport).to.equal('comet');
           helper.recordPrivateApi('read.connectionManager.webSocketTransportAvailable');
           expect(realtime.connection.connectionManager.webSocketTransportAvailable).to.be.ok;
           helper.closeAndFinish(done, realtime);