iOS: Move AppRTC logging methods to public headers.

talk/examples/objc/AppRTCDemo/ARDSignalingMessage.m

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 #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"
 
 static NSString const *kARDSignalingMessageTypeKey = @"type";
 
 @implementation ARDSignalingMessage
 
 @synthesize type = _type;
 
 - (instancetype)initWithType:(ARDSignalingMessageType)type {
   if (self = [super init]) {
     _type = type;
   }
   return self;
 }
 
 - (NSString *)description {
   return [[NSString alloc] initWithData:[self JSONData]
                                encoding:NSUTF8StringEncoding];
 }
 
 + (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;
   }
 
   NSString *typeString = values[kARDSignalingMessageTypeKey];
   ARDSignalingMessage *message = nil;
   if ([typeString isEqualToString:@"candidate"]) {
     RTCICECandidate *candidate =
         [RTCICECandidate candidateFromJSONDictionary:values];
     message = [[ARDICECandidateMessage alloc] initWithCandidate:candidate];
   } else if ([typeString isEqualToString:@"offer"] ||
              [typeString isEqualToString:@"answer"]) {
     RTCSessionDescription *description =
         [RTCSessionDescription descriptionFromJSONDictionary:values];
     message =
         [[ARDSessionDescriptionMessage alloc] initWithDescription:description];
   } else if ([typeString isEqualToString:@"bye"]) {
     message = [[ARDByeMessage alloc] init];
   } else {
-    ARDLog(@"Unexpected type: %@", typeString);
+    RTCLogError(@"Unexpected type: %@", typeString);
   }
   return message;
 }
 
 - (NSData *)JSONData {
   return nil;
 }
 
 @end
 
@@ skipping 49 matching lines @@
 - (NSData *)JSONData {
   NSDictionary *message = @{
     @"type": @"bye"
   };
   return [NSJSONSerialization dataWithJSONObject:message
                                          options:NSJSONWritingPrettyPrinted
                                            error:NULL];
 }
 
 @end