LibWeb: Mark URLSearchParams::to_string() as const

Author: https://github.com/kennethmyhra
Commit: 1b9f5fa28a
Pull-request: https://github.com/SerenityOS/serenity/pull/14595
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWeb/URL/URLSearchParams.cpp

@@ -234,7 +234,7 @@ void URLSearchParams::sort()
     update();
 }
 
-String URLSearchParams::to_string()
+String URLSearchParams::to_string() const
 {
     // return the serialization of this’s list.
     return url_encode(m_list, AK::URL::PercentEncodeSet::ApplicationXWWWFormUrlencoded);

Userland/Libraries/LibWeb/URL/URLSearchParams.h

@@ -41,7 +41,7 @@ public:
 
     void sort();
 
-    String to_string();
+    String to_string() const;
 
     using ForEachCallback = Function<JS::ThrowCompletionOr<void>(String const&, String const&)>;
     JS::ThrowCompletionOr<void> for_each(ForEachCallback);