Fix initialization of Facebook/Twitter Utils blocking the main thread.

Author: nlutsenko

Parse/Internal/User/AuthenticationProviders/Controller/PFUserAuthenticationController.m

@@ -16,6 +16,7 @@
 #import "PFAnonymousUtils.h"
 #import "PFAnonymousAuthenticationProvider.h"
 #import "PFUserController.h"
+#import "PFCurrentUserController.h"
 #import "PFAssert.h"
 
 @interface PFUserAuthenticationController () {
@@ -56,9 +57,11 @@ - (void)registerAuthenticationDelegate:(id<PFUserAuthenticationDelegate>)delegat
     });
 
     // TODO: (nlutsenko) Decouple this further.
-    if (![authType isEqualToString:PFAnonymousUserAuthenticationType]) {
-        [[PFUser currentUser] synchronizeAuthDataWithAuthType:authType];
-    }
+    [[[PFUser currentUserController] getCurrentUserAsyncWithOptions:0] continueWithSuccessBlock:^id(BFTask *task) {
+        PFUser *user = task.result;
+        [user synchronizeAuthDataWithAuthType:authType];
+        return nil;
+    }];
 }
 
 - (void)unregisterAuthenticationDelegateForAuthType:(NSString *)authType {