LibWeb/URL: Make URL::search_params() return a NonnullGCPtr

Userland/Libraries/LibWeb/URL/URL.cpp

@@ -400,7 +400,7 @@ WebIDL::ExceptionOr<void> URL::set_search(String const& search)
 }
 
 // https://url.spec.whatwg.org/#dom-url-searchparams
-URLSearchParams const* URL::search_params() const
+JS::NonnullGCPtr<URLSearchParams const> URL::search_params() const
 {
     // The searchParams getter steps are to return this’s query object.
     return m_query;

Userland/Libraries/LibWeb/URL/URL.h

@@ -55,7 +55,7 @@ public:
     WebIDL::ExceptionOr<String> search() const;
     WebIDL::ExceptionOr<void> set_search(String const&);
 
-    URLSearchParams const* search_params() const;
+    JS::NonnullGCPtr<URLSearchParams const> search_params() const;
 
     WebIDL::ExceptionOr<String> hash() const;
     void set_hash(String const&);