Unreviewed build fix for r262982

https://bugs.webkit.org/show_bug.cgi?id=255468
rdar://107879504

Unreviewed build fix. The delegate method expects an NSHTTPURLResponse, not an NSURLResponse.

* Source/WebKit/NetworkProcess/cocoa/NetworkSessionCocoa.mm:
(-[WKNetworkSessionDelegate URLSession:task:didReceiveInformationalResponse:]):
(-[WKNetworkSessionDelegate URLSession:task:_didReceiveInformationalResponse:]):

Canonical link: https://commits.webkit.org/262986@main

Source/WebKit/NetworkProcess/cocoa/NetworkSessionCocoa.mm

@@ -1033,7 +1033,7 @@ - (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didFini
     }
 }
 
-- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveInformationalResponse:(NSURLResponse *)response
+- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didReceiveInformationalResponse:(NSHTTPURLResponse *)response
 {
     if (auto* networkDataTask = [self existingTask:task]) {
         ASSERT(RunLoop::isMain());
@@ -1046,7 +1046,8 @@ - (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didRece
 // FIXME: Remove when rdar://108002223 can be resolved.
 - (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task _didReceiveInformationalResponse:(NSURLResponse *)response
 {
-    [self URLSession:session task:task didReceiveInformationalResponse:response];
+    if ([response isKindOfClass:[NSHTTPURLResponse class]])
+        [self URLSession:session task:task didReceiveInformationalResponse:(NSHTTPURLResponse *)response];
 }
 
 - (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler