Use TreeScope::completeURL and baseURL instead of the Document versions

Source/core/html/HTMLObjectElement.cpp

Index: Source/core/html/HTMLObjectElement.cpp
diff --git a/Source/core/html/HTMLObjectElement.cpp b/Source/core/html/HTMLObjectElement.cpp
index c2751ebf6bf50e2cbe22c5aa2434900cc588c65c..76d2709da0c1a3b12500a1c79257659dad30e836 100644
--- a/Source/core/html/HTMLObjectElement.cpp
+++ b/Source/core/html/HTMLObjectElement.cpp
@@ -202,7 +202,7 @@ void HTMLObjectElement::parametersForPlugin(Vector<String>& paramNames, Vector<S
     // resource's URL to be given by a param named "src", "movie", "code" or "url"
     // if we know that resource points to a plug-in.
     if (url.isEmpty() && !urlParameter.isEmpty()) {
-        KURL completedURL = document().completeURL(urlParameter);
+        KURL completedURL = treeScope().completeURL(urlParameter);
         bool useFallback;
         if (shouldUsePlugin(completedURL, serviceType, false, useFallback))
             url = urlParameter;