iOS: Move AppRTC logging methods to public headers.

talk/examples/objc/AppRTCDemo/ARDSignalingMessage.m

Index: talk/examples/objc/AppRTCDemo/ARDSignalingMessage.m
diff --git a/talk/examples/objc/AppRTCDemo/ARDSignalingMessage.m b/talk/examples/objc/AppRTCDemo/ARDSignalingMessage.m
index dc00e8f77c3c8f0528ac7de254ae8a582f5ae00b..4d49a2eada980f63256033245226345ac25b0a0a 100644
--- a/talk/examples/objc/AppRTCDemo/ARDSignalingMessage.m
+++ b/talk/examples/objc/AppRTCDemo/ARDSignalingMessage.m
@@ -27,7 +27,8 @@
 
 #import "ARDSignalingMessage.h"
 
-#import "ARDLogging.h"
+#import "RTCLogging.h"

[Chuck, 2015/07/23 18:21:45]

Should this be grouped with the other RTC headers?

[tkchin_webrtc, 2015/07/23 18:30:00]

No, the ones at the bottom are extensions added by the app, whereas this one is
truly "third-party"

+
 #import "ARDUtilities.h"
 #import "RTCICECandidate+JSON.h"
 #import "RTCSessionDescription+JSON.h"
@@ -53,7 +54,7 @@ static NSString const *kARDSignalingMessageTypeKey = @"type";
 + (ARDSignalingMessage *)messageFromJSONString:(NSString *)jsonString {
   NSDictionary *values = [NSDictionary dictionaryWithJSONString:jsonString];
   if (!values) {
-    ARDLog(@"Error parsing signaling message JSON.");
+    RTCLogError(@"Error parsing signaling message JSON.");
     return nil;
   }
 
@@ -72,7 +73,7 @@ static NSString const *kARDSignalingMessageTypeKey = @"type";
   } else if ([typeString isEqualToString:@"bye"]) {
     message = [[ARDByeMessage alloc] init];
   } else {
-    ARDLog(@"Unexpected type: %@", typeString);
+    RTCLogError(@"Unexpected type: %@", typeString);
   }
   return message;
 }