Minor clean up.

// FREEBIE

src/Messages/Interactions/TSInfoMessage.h

@@ -1,5 +1,6 @@
-//  Created by Frederic Jacobs on 15/11/14.
+//
-//  Copyright (c) 2014 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//
 
 #import "TSMessage.h"
 
@@ -16,8 +17,7 @@ typedef NS_ENUM(NSInteger, TSInfoMessageType) {
     TSInfoMessageTypeDisappearingMessagesUpdate
 };
 
-+ (instancetype)userNotRegisteredMessageInThread:(TSThread *)thread
++ (instancetype)userNotRegisteredMessageInThread:(TSThread *)thread;
-                                     transaction:(YapDatabaseReadWriteTransaction *)transaction;
 
 @property TSInfoMessageType messageType;
 @property NSString *customMessage;

src/Messages/Interactions/TSInfoMessage.m

@@ -1,5 +1,6 @@
-//  Created by Frederic Jacobs on 15/11/14.
+//
-//  Copyright (c) 2014 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//
 
 #import "NSDate+millisecondTimeStamp.h"
 #import "TSInfoMessage.h"
@@ -44,8 +45,7 @@ NS_ASSUME_NONNULL_BEGIN
     return self;
 }
 
-+ (instancetype)userNotRegisteredMessageInThread:(TSThread *)thread
++ (instancetype)userNotRegisteredMessageInThread:(TSThread *)thread {
-                                     transaction:(YapDatabaseReadWriteTransaction *)transaction {
     return [[self alloc] initWithTimestamp:[NSDate ows_millisecondTimeStamp]
                                   inThread:thread
                                messageType:TSInfoMessageUserNotRegistered];

src/Messages/OWSMessageSender.m

@@ -399,7 +399,7 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
 {
     [self.dbConnection asyncReadWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
         [recipient removeWithTransaction:transaction];
-        [[TSInfoMessage userNotRegisteredMessageInThread:thread transaction:transaction]
+        [[TSInfoMessage userNotRegisteredMessageInThread:thread]
             saveWithTransaction:transaction];
     }];
 }