Streamline frame detach

Source/core/frame/RemoteFrame.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/frame/RemoteFrame.h"
 
 #include "core/frame/RemoteFrameClient.h"
 #include "core/frame/RemoteFrameView.h"
 #include "core/html/HTMLFrameOwnerElement.h"
@@ skipping 16 matching lines @@
 }
 
 void RemoteFrame::navigate(Document&, const KURL& url, const Referrer& referrer, bool lockBackForwardList)
 {
     remoteFrameClient()->navigate(ResourceRequest(url, referrer), lockBackForwardList);
 }
 
 void RemoteFrame::detach()
 {
     detachChildren();
-    m_host = nullptr;
+    Frame::detach();
 }
 
 void RemoteFrame::setView(PassRefPtr<RemoteFrameView> view)
 {
     m_view = view;
 }
 
 void RemoteFrame::createView()
 {
     RefPtr<RemoteFrameView> view = RemoteFrameView::create(this);
     setView(view);
 
     if (ownerRenderer()) {
         HTMLFrameOwnerElement* owner = deprecatedLocalOwner();
         ASSERT(owner);
         owner->setWidget(view);
     }
 }
 
 RemoteFrameClient* RemoteFrame::remoteFrameClient() const
 {
     return static_cast<RemoteFrameClient*>(client());
 }
 
 } // namespace blink