iOS AppRTC: First unit test.

Tests basic session ICE connection by stubbing out network components, which have been refactored to faciliate testing.

BUG=3994
R=jiayl@webrtc.org, kjellander@webrtc.org, phoglund@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/28349004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@8002 4adac7df-926f-26a2-2b94-8c16560cd09d

talk/examples/objc/AppRTCDemo/ARDMessageResponse.m

@@ -25,18 +25,12 @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#import "ARDMessageResponse.h"
+#import "ARDMessageResponse+Internal.h"
 
 #import "ARDUtilities.h"
 
 static NSString const *kARDMessageResultKey = @"result";
 
-@interface ARDMessageResponse ()
-
-@property(nonatomic, assign) ARDMessageResultType result;
-
-@end
-
 @implementation ARDMessageResponse
 
 @synthesize result = _result;