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

BUG=webrtc:5886

Review-Url: https://codereview.webrtc.org/1990903002
Cr-Commit-Position: refs/heads/master@{#12805}
diff --git a/webrtc/examples/objc/AppRTCDemo/ARDAppEngineClient.m b/webrtc/examples/objc/AppRTCDemo/ARDAppEngineClient.m
index 0ba32c4..d707b92 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;
diff --git a/webrtc/examples/objc/AppRTCDemo/ios/ARDAppDelegate.h b/webrtc/examples/objc/AppRTCDemo/ios/ARDAppDelegate.h
index c73e8f2..64b06a3 100644
--- a/webrtc/examples/objc/AppRTCDemo/ios/ARDAppDelegate.h
+++ b/webrtc/examples/objc/AppRTCDemo/ios/ARDAppDelegate.h
@@ -12,6 +12,6 @@
 
 // The main application class of the AppRTCDemo iOS app demonstrating
 // interoperability between the Objective C implementation of PeerConnection
-// and the apprtc.appspot.com demo webapp.
+// and the appr.tc demo webapp.
 @interface ARDAppDelegate : NSObject <UIApplicationDelegate>
 @end