iOS: Move AppRTC logging methods to public headers.

talk/examples/objc/AppRTCDemo/ios/ARDAppDelegate.m

Index: talk/examples/objc/AppRTCDemo/ios/ARDAppDelegate.m
diff --git a/talk/examples/objc/AppRTCDemo/ios/ARDAppDelegate.m b/talk/examples/objc/AppRTCDemo/ios/ARDAppDelegate.m
index 352ade60c7e9660f2b1f03cd4c4fa274bf5e8e15..09e437426068c005c83932617829120ca9f7a266 100644
--- a/talk/examples/objc/AppRTCDemo/ios/ARDAppDelegate.m
+++ b/talk/examples/objc/AppRTCDemo/ios/ARDAppDelegate.m
@@ -27,10 +27,11 @@
 
 #import "ARDAppDelegate.h"
 
-#import "ARDLogging.h"
-#import "ARDMainViewController.h"
+#import "RTCLogging.h"
 #import "RTCPeerConnectionFactory.h"
 
+#import "ARDMainViewController.h"
+
 @implementation ARDAppDelegate {
   UIWindow *_window;
 }
@@ -44,7 +45,14 @@
   [_window makeKeyAndVisible];
   ARDMainViewController *viewController = [[ARDMainViewController alloc] init];
   _window.rootViewController = viewController;
-  ARDLogInit();
+
+#ifndef _DEBUG
+  // 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);
+#endif
+
   return YES;
 }