Respond to CR.

// FREEBIE

src/Contacts/ContactsUpdater.h

@@ -6,9 +6,6 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-extern NSString *const kContactsUpdaterErrorDomain;
-extern const NSInteger kContactsUpdaterRateLimitErrorCode;
-
 @class Contact;
 
 @interface ContactsUpdater : NSObject

src/Contacts/ContactsUpdater.m

@@ -14,9 +14,6 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-NSString *const kContactsUpdaterErrorDomain = @"kContactsUpdaterErrorDomain";
-const NSInteger kContactsUpdaterRateLimitErrorCode = 413;
-
 @implementation ContactsUpdater
 
 + (instancetype)sharedUpdater {
@@ -211,10 +208,8 @@ const NSInteger kContactsUpdaterRateLimitErrorCode = 413;
           failure:^(NSURLSessionDataTask *task, NSError *error) {
               NSHTTPURLResponse *response = (NSHTTPURLResponse *)task.response;
               if (response.statusCode == 413) {
-                  NSString *const kContactsUpdaterErrorDomain = @"kContactsUpdaterErrorDomain";
-                  failure([NSError errorWithDomain:kContactsUpdaterErrorDomain
-                                              code:kContactsUpdaterRateLimitErrorCode
-                                          userInfo:nil]);
+                  failure(OWSErrorWithCodeDescription(
+                      OWSErrorCodeContactsUpdaterRateLimit, OWSSignalServiceKitErrorDomain));
               } else {
                   failure(error);
               }

src/Util/OWSError.h

@@ -23,6 +23,7 @@ typedef NS_ENUM(NSInteger, OWSErrorCode) {
     OWSErrorCodeNoSuchSignalRecipient = 777404,
     OWSErrorCodeMessageSendDisabledDueToPreKeyUpdateFailures = 777405,
     OWSErrorCodeMessageSendFailedToBlockList = 777406,
+    OWSErrorCodeContactsUpdaterRateLimit = 777407,
 };
 
 extern NSError *OWSErrorWithCodeDescription(OWSErrorCode code, NSString *description);