Don't adopt result of NSURLSession.sessionWithConfiguration

https://bugs.webkit.org/show_bug.cgi?id=263501

Reviewed by Chris Dumez.

If it were ever released, it would cause memory corruption.
It's not, but still not good practice.

* Source/WebKit/NetworkProcess/PrivateClickMeasurement/cocoa/PrivateClickMeasurementNetworkLoaderCocoa.mm:
(WebKit::PCM::statelessSessionWithoutRedirects):

Canonical link: https://commits.webkit.org/269631@main

Source/WebKit/NetworkProcess/PrivateClickMeasurement/cocoa/PrivateClickMeasurementNetworkLoaderCocoa.mm

@@ -96,7 +96,7 @@ - (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didRece
         configuration.URLCache = nil;
         configuration.HTTPCookieStorage = nil;
         configuration._shouldSkipPreferredClientCertificateLookup = YES;
-        return adoptNS([NSURLSession sessionWithConfiguration:configuration delegate:delegate.get().get() delegateQueue:[NSOperationQueue mainQueue]]);
+        return [NSURLSession sessionWithConfiguration:configuration delegate:delegate.get().get() delegateQueue:[NSOperationQueue mainQueue]];
     }();
     return session.get().get();
 }