Remove old WebFrameClient path for disowning openers.

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 133 matching lines @@
     virtual void didAccessInitialDocument(WebLocalFrame*) { }
 
     // A child frame was created in this frame. This is called when the frame
     // is created and initialized. Takes the name of the new frame, the parent
     // frame and returns a new WebFrame. The WebFrame is considered in-use
     // until frameDetached() is called on it.
     // Note: If you override this, you should almost certainly be overriding
     // frameDetached().
     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.
-    // TODO(alexmos): Remove this once didChangeOpener is implemented in content.
-    virtual void didDisownOpener(WebLocalFrame*) { }
-
     // This frame has set its opener to another frame, or disowned the opener
     // if opener is null. See http://html.spec.whatwg.org/#dom-opener.
     virtual void didChangeOpener(WebFrame*) { }
 
     // 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) { }
 
@@ skipping 501 matching lines @@
     // WebUSB --------------------------------------------------------------
     virtual WebUSBClient* usbClient() { return nullptr; }
 
 protected:
     virtual ~WebFrameClient() { }
 };
 
 } // namespace blink
 
 #endif