Update iOS AppRTCDemo to use the updated Objective-C API.

webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.m

Index: webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.m
diff --git a/webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.m b/webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.m
index 6a8d37fbedc6d9ac9c344d44597ad376d08576e1..56542ce07b6314ce6f0c308c8d3946af82dad5ff 100644
--- a/webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.m
+++ b/webrtc/examples/objc/AppRTCDemo/ARDSignalingMessage.m
@@ -10,10 +10,10 @@
 
 #import "ARDSignalingMessage.h"
 
-#import "RTCLogging.h"
+#import "webrtc/base/objc/RTCLogging.h"
 
 #import "ARDUtilities.h"
-#import "RTCICECandidate+JSON.h"
+#import "RTCIceCandidate+JSON.h"
 #import "RTCSessionDescription+JSON.h"
 
 static NSString const *kARDSignalingMessageTypeKey = @"type";
@@ -44,8 +44,8 @@ static NSString const *kARDSignalingMessageTypeKey = @"type";
   NSString *typeString = values[kARDSignalingMessageTypeKey];
   ARDSignalingMessage *message = nil;
   if ([typeString isEqualToString:@"candidate"]) {
-    RTCICECandidate *candidate =
-        [RTCICECandidate candidateFromJSONDictionary:values];
+    RTCIceCandidate *candidate =
+        [RTCIceCandidate candidateFromJSONDictionary:values];
     message = [[ARDICECandidateMessage alloc] initWithCandidate:candidate];
   } else if ([typeString isEqualToString:@"offer"] ||
              [typeString isEqualToString:@"answer"]) {
@@ -71,7 +71,7 @@ static NSString const *kARDSignalingMessageTypeKey = @"type";
 
 @synthesize candidate = _candidate;
 
-- (instancetype)initWithCandidate:(RTCICECandidate *)candidate {
+- (instancetype)initWithCandidate:(RTCIceCandidate *)candidate {
   if (self = [super initWithType:kARDSignalingMessageTypeCandidate]) {
     _candidate = candidate;
   }