iOS: Move AppRTC logging methods to public headers.

talk/examples/objc/AppRTCDemo/RTCICECandidate+JSON.m

 /*
  * libjingle
  * Copyright 2014 Google Inc.
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  *     derived from this software without specific prior written permission.
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  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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 #import "RTCICECandidate+JSON.h"
 
-#import "ARDLogging.h"
+#import "RTCLogging.h"
 
 static NSString const *kRTCICECandidateTypeKey = @"type";
 static NSString const *kRTCICECandidateTypeValue = @"candidate";
 static NSString const *kRTCICECandidateMidKey = @"id";
 static NSString const *kRTCICECandidateMLineIndexKey = @"label";
 static NSString const *kRTCICECandidateSdpKey = @"candidate";
 
 @implementation RTCICECandidate (JSON)
 
 + (RTCICECandidate *)candidateFromJSONDictionary:(NSDictionary *)dictionary {
@@ skipping 10 matching lines @@
     kRTCICECandidateMLineIndexKey : @(self.sdpMLineIndex),
     kRTCICECandidateMidKey : self.sdpMid,
     kRTCICECandidateSdpKey : self.sdp
   };
   NSError *error = nil;
   NSData *data =
       [NSJSONSerialization dataWithJSONObject:json
                                       options:NSJSONWritingPrettyPrinted
                                         error:&error];
   if (error) {
-    ARDLog(@"Error serializing JSON: %@", error);
+    RTCLogError(@"Error serializing JSON: %@", error);
     return nil;
   }
   return data;
 }
 
 @end