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..c9bc3f19b0a1b770c4d2aa8cb3f6444dec71be28 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;
   }
@@ -89,16 +89,18 @@ static NSString const *kARDSignalingMessageTypeKey = @"type";
 @synthesize sessionDescription = _sessionDescription;
 
 - (instancetype)initWithDescription:(RTCSessionDescription *)description {
-  ARDSignalingMessageType type = kARDSignalingMessageTypeOffer;
-  NSString *typeString = description.type;
-  if ([typeString isEqualToString:@"offer"]) {
-    type = kARDSignalingMessageTypeOffer;
-  } else if ([typeString isEqualToString:@"answer"]) {
-    type = kARDSignalingMessageTypeAnswer;
-  } else {
-    NSAssert(NO, @"Unexpected type: %@", typeString);
+  ARDSignalingMessageType messageType = kARDSignalingMessageTypeOffer;
+  RTCSdpType sdpType = description.type;
+  switch (sdpType) {
+    case RTCSdpTypeOffer:
+      messageType = kARDSignalingMessageTypeOffer;
+    case RTCSdpTypeAnswer:
+      messageType = kARDSignalingMessageTypeAnswer;
+    case RTCSdpTypePrAnswer:
+      NSAssert(NO, @"Unexpected type: %@",
+          [RTCSessionDescription stringForType:sdpType]);
   }
-  if (self = [super initWithType:type]) {
+  if (self = [super initWithType:messageType]) {
     _sessionDescription = description;
   }
   return self;