Gracefully handle a self-referential opener in frame swap.

third_party/WebKit/Source/web/WebFrame.cpp

 // 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.
 
 #include "config.h"
 #include "public/web/WebFrame.h"
 
 #include "bindings/core/v8/WindowProxyManager.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
@@ skipping 56 matching lines @@
     if (m_previousSibling) {
         m_previousSibling->m_nextSibling = frame;
         swap(m_previousSibling, frame->m_previousSibling);
     }
     if (m_nextSibling) {
         m_nextSibling->m_previousSibling = frame;
         swap(m_nextSibling, frame->m_nextSibling);
     }
 
     if (m_opener) {
-        m_opener->m_openedFrameTracker->remove(this);
-        m_opener->m_openedFrameTracker->add(frame);
-        swap(m_opener, frame->m_opener);
+        frame->setOpener(m_opener);
+        setOpener(nullptr);
     }
-    if (!m_openedFrameTracker->isEmpty()) {
-        m_openedFrameTracker->updateOpener(frame);
-        frame->m_openedFrameTracker.reset(m_openedFrameTracker.release());
-    }
+    m_openedFrameTracker->transferTo(frame);
 
     FrameHost* host = oldFrame->host();
     AtomicString name = oldFrame->tree().name();
     FrameOwner* owner = oldFrame->owner();
     oldFrame->disconnectOwnerElement();
 
     v8::HandleScope handleScope(v8::Isolate::GetCurrent());
     HashMap<DOMWrapperWorld*, v8::Local<v8::Object>> globals;
     oldFrame->windowProxyManager()->clearForNavigation();
     oldFrame->windowProxyManager()->releaseGlobals(globals);
@@ skipping 264 matching lines @@
     void WebFrame::traceFrames(VisitorDispatcher visitor, WebFrame* frame) { traceFramesImpl(visitor, frame); }                \
     void WebFrame::clearWeakFrames(VisitorDispatcher visitor) { clearWeakFramesImpl(visitor); }
 
 DEFINE_VISITOR_METHOD(Visitor*)
 DEFINE_VISITOR_METHOD(InlinedGlobalMarkingVisitor)
 
 #undef DEFINE_VISITOR_METHOD
 #endif
 
 } // namespace blink