Convert HTMLFrameOwnerElement and FocusController to use Frame.

Source/web/WebPageSerializer.cpp

Index: Source/web/WebPageSerializer.cpp
diff --git a/Source/web/WebPageSerializer.cpp b/Source/web/WebPageSerializer.cpp
index ac543d6b2c368cefdac827f7c9f1d0be2be9777d..ac90aa66b29c6feba404472ff9ebf882a384066d 100644
--- a/Source/web/WebPageSerializer.cpp
+++ b/Source/web/WebPageSerializer.cpp
@@ -113,9 +113,10 @@ void retrieveResourcesForElement(Element* element,
     if ((element->hasTagName(HTMLNames::iframeTag) || element->hasTagName(HTMLNames::frameTag)
         || element->hasTagName(HTMLNames::objectTag) || element->hasTagName(HTMLNames::embedTag))
             && element->isFrameOwnerElement()) {
-        if (LocalFrame* frame = toHTMLFrameOwnerElement(element)->contentFrame()) {
-            if (!visitedFrames->contains(frame))
-                framesToVisit->append(frame);
+        Frame* frame = toHTMLFrameOwnerElement(element)->contentFrame();
+        if (frame && frame->isLocalFrame()) {
+            if (!visitedFrames->contains(toLocalFrame(frame)))
+                framesToVisit->append(toLocalFrame(frame));
             return;
         }
     }