Update AppRTCDemo AppRTC URL's on iOS to appr.tc

webrtc/examples/objc/AppRTCDemo/ARDAppEngineClient.m

Index: webrtc/examples/objc/AppRTCDemo/ARDAppEngineClient.m
diff --git a/webrtc/examples/objc/AppRTCDemo/ARDAppEngineClient.m b/webrtc/examples/objc/AppRTCDemo/ARDAppEngineClient.m
index 0ba32c448a2e7a3066fed9707421bb3376d73fdb..d707b92d4486be631f5de4deab0d91e4a662aff1 100644
--- a/webrtc/examples/objc/AppRTCDemo/ARDAppEngineClient.m
+++ b/webrtc/examples/objc/AppRTCDemo/ARDAppEngineClient.m
@@ -19,15 +19,15 @@
 
 // TODO(tkchin): move these to a configuration object.
 static NSString * const kARDRoomServerHostUrl =
-    @"https://apprtc.appspot.com";
+    @"https://appr.tc";
 static NSString * const kARDRoomServerJoinFormat =
-    @"https://apprtc.appspot.com/join/%@";
+    @"https://appr.tc/join/%@";
 static NSString * const kARDRoomServerJoinFormatLoopback =
-    @"https://apprtc.appspot.com/join/%@?debug=loopback";
+    @"https://appr.tc/join/%@?debug=loopback";
 static NSString * const kARDRoomServerMessageFormat =
-    @"https://apprtc.appspot.com/message/%@/%@";
+    @"https://appr.tc/message/%@/%@";
 static NSString * const kARDRoomServerLeaveFormat =
-    @"https://apprtc.appspot.com/leave/%@/%@";
+    @"https://appr.tc/leave/%@/%@";
 
 static NSString * const kARDAppEngineClientErrorDomain = @"ARDAppEngineClient";
 static NSInteger const kARDAppEngineClientErrorBadResponse = -1;