Reland "Streamline frame detach"

Source/web/RemoteFrameClientImpl.h

 // 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.
 
 #ifndef RemoteFrameClientImpl_h
 #define RemoteFrameClientImpl_h
 
 #include "core/frame/RemoteFrameClient.h"
 
 namespace blink {
 class WebRemoteFrameImpl;
 
 class RemoteFrameClientImpl : public RemoteFrameClient {
 public:
     explicit RemoteFrameClientImpl(WebRemoteFrameImpl*);
 
     // FrameClient overrides:
+    virtual void detached() override;
+
     virtual Frame* opener() const override;
     virtual void setOpener(Frame*) override;
 
     virtual Frame* parent() const override;
     virtual Frame* top() const override;
     virtual Frame* previousSibling() const override;
     virtual Frame* nextSibling() const override;
     virtual Frame* firstChild() const override;
     virtual Frame* lastChild() const override;
 
     virtual bool willCheckAndDispatchMessageEvent(SecurityOrigin*, MessageEvent*, LocalFrame*) const override;
 
     // RemoteFrameClient overrides:
     virtual void navigate(const ResourceRequest&, bool shouldReplaceCurrentEntry) override;
 
     WebRemoteFrameImpl* webFrame() const { return m_webFrame; }
 
 private:
     WebRemoteFrameImpl* m_webFrame;
 };
 
 } // namespace blink
 
 #endif // RemoteFrameClientImpl_h