Remove old WebFrameClient path for disowning openers.

Source/web/WebLocalFrameImpl.cpp

Index: Source/web/WebLocalFrameImpl.cpp
diff --git a/Source/web/WebLocalFrameImpl.cpp b/Source/web/WebLocalFrameImpl.cpp
index 4b316952f8c3cfc64754fdbec9b4b7ef04991323..794d2a71e9192964136fd50403b2d825c11659d3 100644
--- a/Source/web/WebLocalFrameImpl.cpp
+++ b/Source/web/WebLocalFrameImpl.cpp
@@ -739,12 +739,6 @@ WebView* WebLocalFrameImpl::view() const
 
 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);