Minor ObjC header updates.

BUG=

Review URL: https://codereview.webrtc.org/1845133002

Cr-Commit-Position: refs/heads/master@{#12183}
diff --git a/webrtc/examples/objc/AppRTCDemo/ios/ARDAppDelegate.m b/webrtc/examples/objc/AppRTCDemo/ios/ARDAppDelegate.m
index b169ca4..c18c818 100644
--- a/webrtc/examples/objc/AppRTCDemo/ios/ARDAppDelegate.m
+++ b/webrtc/examples/objc/AppRTCDemo/ios/ARDAppDelegate.m
@@ -37,7 +37,7 @@
   // In debug builds the default level is LS_INFO and in non-debug builds it is
   // disabled. Continue to log to console in non-debug builds, but only
   // warnings and errors.
-  RTCSetMinDebugLogLevel(kRTCLoggingSeverityWarning);
+  RTCSetMinDebugLogLevel(RTCLoggingSeverityWarning);
 #endif
 
   return YES;