Remove old WebFrameClient path for disowning openers.

Source/web/WebLocalFrameImpl.cpp

 /*
  * Copyright (C) 2009 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 721 matching lines @@
     return frame() && frame()->view() && frame()->view()->verticalScrollbar();
 }
 
 WebView* WebLocalFrameImpl::view() const
 {
     return viewImpl();
 }
 
 void WebLocalFrameImpl::setOpener(WebFrame* opener)
 {
-    // TODO(alexmos): Remove this once didChangeOpener is implemented in
-    // content, as all opener updates will go through it, including disowned
-    // openers.
-    if (WebFrame::opener() && !opener && m_client)
-        m_client->didDisownOpener(this);
-
     WebFrame::setOpener(opener);
 
     ASSERT(m_frame);
     if (m_frame && m_frame->document())
         m_frame->document()->initSecurityContext();
 }
 
 WebDocument WebLocalFrameImpl::document() const
 {
     if (!frame() || !frame()->document())
@@ skipping 1438 matching lines @@
 }
 
 WebSandboxFlags WebLocalFrameImpl::effectiveSandboxFlags() const
 {
     if (!frame())
         return WebSandboxFlags::None;
     return static_cast<WebSandboxFlags>(frame()->loader().effectiveSandboxFlags());
 }
 
 } // namespace blink