DilloURL has a dtor.

It is the same as the original free function.  But this
will let me put some ownership on various members and slowly
start to C++ify this core type.

src/styleengine.cc

@@ -108,8 +108,8 @@ StyleEngine::~StyleEngine () {
    stackPop (); // dummy node on the bottom of the stack
    assert (stack.size () == 0);
 
-   a_Url_free(pageUrl);
-   a_Url_free(baseUrl);
+   delete pageUrl;
+   delete baseUrl;
 
    delete doctree;
    delete cssContext;
@@ -779,7 +779,7 @@ void StyleEngine::apply (int i, StyleAttrs *attrs, CssPropertyList *props,
                      (new StyleImageDeletionReceiver (clientKey));
       }
    }
-   a_Url_free (imgUrl);
+   delete imgUrl;
 }
 
 /**