Change CookieStore::DeleteCallback to take uint32_t.

ios/chrome/browser/net/cookie_util.mm

Index: ios/chrome/browser/net/cookie_util.mm
diff --git a/ios/chrome/browser/net/cookie_util.mm b/ios/chrome/browser/net/cookie_util.mm
index 48a2187775c100e41acfce2cbb34e57af90aa622..9078cda81d29c1735fa58af910aeeb6a8cef9509 100644
--- a/ios/chrome/browser/net/cookie_util.mm
+++ b/ios/chrome/browser/net/cookie_util.mm
@@ -8,6 +8,8 @@
 #include <stddef.h>
 #include <sys/sysctl.h>
 
+#include <cstdint>
+
 #include "base/logging.h"
 #import "base/mac/bind_objc_block.h"
 #include "base/memory/ptr_util.h"
@@ -34,7 +36,7 @@ namespace {
 NSString* const kLastCookieDeletionDate = @"LastCookieDeletionDate";
 
 // Empty callback.
-void DoNothing(int n) {}
+void DoNothing(uint32_t n) {}
 
 // Creates a SQLitePersistentCookieStore running on a background thread.
 scoped_refptr<net::SQLitePersistentCookieStore> CreatePersistentCookieStore(