Revert of Detach old frame on WebFrame::swap.

public/web/WebFrameClient.h

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 141 matching lines @@
     virtual WebFrame* createChildFrame(WebLocalFrame* parent, WebTreeScopeType, const WebString& frameName, WebSandboxFlags sandboxFlags) { return nullptr; }
 
     // This frame set its opener to null, disowning it.
     // See http://html.spec.whatwg.org/#dom-opener.
     virtual void didDisownOpener(WebLocalFrame*) { }
 
     // Specifies the reason for the detachment.
     enum class DetachType { Remove, Swap };
 
     // This frame has been detached from the view, but has not been closed yet.
-    virtual void frameDetached(WebFrame*, DetachType) { }
+    virtual void frameDetached(WebFrame*) { }
 
     // This frame has become focused..
     virtual void frameFocused() { }
 
     // This frame is about to be closed. This is called after frameDetached,
     // when the document is being unloaded, due to new one committing.
     virtual void willClose(WebFrame*) { }
 
     // This frame's name has changed.
     virtual void didChangeName(WebLocalFrame*, const WebString&) { }
@@ skipping 473 matching lines @@
     // App Banners ---------------------------------------------------------
     virtual WebAppBannerClient* appBannerClient() { return 0; }
 
 protected:
     virtual ~WebFrameClient() { }
 };
 
 } // namespace blink
 
 #endif