Revert 170347 "Convert HTMLFrameOwnerElement and FocusController..."

Source/core/frame/LocalFrame.cpp

Index: Source/core/frame/LocalFrame.cpp
===================================================================
--- Source/core/frame/LocalFrame.cpp	(revision 170478)
+++ Source/core/frame/LocalFrame.cpp	(working copy)
@@ -102,6 +102,10 @@
     , m_orientation(0)
     , m_inViewSourceMode(false)
 {
+    if (this->ownerElement()) {
+        page()->incrementSubframeCount();
+        this->ownerElement()->setContentFrame(*this);
+    }
 }
 
 PassRefPtr<LocalFrame> LocalFrame::create(FrameLoaderClient* client, FrameHost* host, HTMLFrameOwnerElement* ownerElement)
@@ -118,6 +122,8 @@
     setView(nullptr);
     loader().clear();
     setDOMWindow(nullptr);
+
+    disconnectOwnerElement();
 }
 
 bool LocalFrame::inScope(TreeScope* scope) const
@@ -258,6 +264,18 @@
     Frame::detachFromFrameHost();
 }
 
+void LocalFrame::disconnectOwnerElement()
+{
+    if (ownerElement()) {
+        if (Document* doc = document())
+            doc->topDocument().clearAXObjectCache();
+        ownerElement()->clearContentFrame();
+        if (page())
+            page()->decrementSubframeCount();
+    }
+    m_ownerElement = 0;
+}
+
 String LocalFrame::documentTypeString() const
 {
     if (DocumentType* doctype = document()->doctype())