Revert 170347 "Convert HTMLFrameOwnerElement and FocusController..."

Source/web/WebPageSerializer.cpp

Index: Source/web/WebPageSerializer.cpp
===================================================================
--- Source/web/WebPageSerializer.cpp	(revision 170478)
+++ Source/web/WebPageSerializer.cpp	(working copy)
@@ -86,10 +86,9 @@
     ASSERT(element);
     // If the node is a frame, we'll process it later in retrieveResourcesForFrame.
     if (isHTMLFrameElementBase(*element) || isHTMLObjectElement(*element) || isHTMLEmbedElement(*element)) {
-        Frame* frame = toHTMLFrameOwnerElement(element)->contentFrame();
-        if (frame && frame->isLocalFrame()) {
-            if (!visitedFrames->contains(toLocalFrame(frame)))
-                framesToVisit->append(toLocalFrame(frame));
+        if (LocalFrame* frame = toHTMLFrameOwnerElement(element)->contentFrame()) {
+            if (!visitedFrames->contains(frame))
+                framesToVisit->append(frame);
             return;
         }
     }