Respond to CR.

SignalServiceKit/src/Util/OWSBackupFragment.h

@@ -38,7 +38,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, nullable) NSNumber *uncompressedDataLength;
 
 - (instancetype)init NS_UNAVAILABLE;
-- (instancetype)initWithUniqueId:(NSString *)uniqueId NS_DESIGNATED_INITIALIZER;
 
 @end
 

SignalServiceKit/src/Util/OWSBackupFragment.m

@@ -8,16 +8,6 @@ NS_ASSUME_NONNULL_BEGIN
 
 @implementation OWSBackupFragment
 
-- (instancetype)initWithUniqueId:(NSString *)uniqueId
-{
-    self = [super initWithUniqueId:uniqueId];
-    if (!self) {
-        return self;
-    }
-
-    return self;
-}
-
 @end
 
 NS_ASSUME_NONNULL_END