Rename RTCIceConnectionStateMax to RTCIceConnectionStateCount in Objective-C API.

BUG=

Review URL: https://codereview.webrtc.org/1799443006

Cr-Commit-Position: refs/heads/master@{#11987}
diff --git a/webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallViewController.m b/webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallViewController.m
index 5fad762..60448b7 100644
--- a/webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallViewController.m
+++ b/webrtc/examples/objc/AppRTCDemo/ios/ARDVideoCallViewController.m
@@ -203,7 +203,7 @@
     case RTCIceConnectionStateFailed:
     case RTCIceConnectionStateDisconnected:
     case RTCIceConnectionStateClosed:
-    case RTCIceConnectionStateMax:
+    case RTCIceConnectionStateCount:
       return nil;
   }
 }