Fix the Mac Catalyst build
https://bugs.webkit.org/show_bug.cgi?id=241948
rdar://87794804

Reviewed by Ryan Haddad.

* Source/WebKit/UIProcess/API/Cocoa/WKWebViewTesting.mm:

Canonical link: https://commits.webkit.org/251769.5@safari-7614.1.19-branch

Source/WebKit/UIProcess/API/Cocoa/WKWebViewTesting.mm

diff --git a/Source/WebKit/UIProcess/API/Cocoa/WKWebViewTesting.mm b/Source/WebKit/UIProcess/API/Cocoa/WKWebViewTesting.mm
index e688a4a..0d5fb8b 100644
--- a/Source/WebKit/UIProcess/API/Cocoa/WKWebViewTesting.mm
+++ b/Source/WebKit/UIProcess/API/Cocoa/WKWebViewTesting.mm
@@ -44,10 +44,13 @@
 #import <wtf/RetainPtr.h>
 
 #if PLATFORM(MAC)
-#import "WindowServerConnection.h"
 #import "WKWebViewMac.h"
 #endif
 
+#if PLATFORM(MAC) || PLATFORM(MACCATALYST)
+#import "WindowServerConnection.h"
+#endif
+
 #if PLATFORM(IOS_FAMILY)
 #import "WKWebViewIOS.h"
 #endif