Detach old frame on WebFrame::swap.

Source/core/frame/LocalFrame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 255 matching lines @@
             return;
         FrameLoadRequest request = FrameLoadRequest(
             nullptr, m_loader.resourceRequestForReload(loadType, KURL(), clientRedirectPolicy));
         request.setClientRedirect(clientRedirectPolicy);
         m_loader.load(request, loadType);
     } else {
         m_navigationScheduler.scheduleReload();
     }
 }
 
-void LocalFrame::detach()
+void LocalFrame::detach(FrameDetachType type)
 {
     PluginScriptForbiddenScope forbidPluginDestructorScripting;
     // A lot of the following steps can result in the current frame being
     // detached, so protect a reference to it.
     RefPtrWillBeRawPtr<LocalFrame> protect(this);
     m_loader.stopAllLoaders();
     m_loader.dispatchUnloadEvent();
     detachChildren();
     // stopAllLoaders() needs to be called after detachChildren(), because detachChildren()
     // will trigger the unload event handlers of any child frames, and those event
     // handlers might start a new subresource load in this frame.
     m_loader.stopAllLoaders();
     m_loader.detach();
     document()->detach();
     m_loader.clear();
     if (!client())
         return;
 
     client()->willBeDetached();
     // Notify ScriptController that the frame is closing, since its cleanup ends up calling
     // back to FrameLoaderClient via WindowProxy.
     script().clearForClose();
     ScriptForbiddenScope forbidScript;
     setView(nullptr);
     willDetachFrameHost();
     InspectorInstrumentation::frameDetachedFromParent(this);
-    Frame::detach();
+    Frame::detach(type);
 
     // Signal frame destruction here rather than in the destructor.
     // Main motivation is to avoid being dependent on its exact timing (Oilpan.)
     LocalFrameLifecycleNotifier::notifyContextDestroyed();
     m_supplements.clear();
     WeakIdentifierMap<LocalFrame>::notifyObjectDestroyed(this);
 }
 
+bool LocalFrame::prepareForCommit()
+{
+    return loader().prepareForCommit();
+}
+
 SecurityContext* LocalFrame::securityContext() const
 {
     return document();
 }
 
 void LocalFrame::printNavigationErrorMessage(const Frame& targetFrame, const char* reason)
 {
     // URLs aren't available for RemoteFrames, so the error message uses their
     // origin instead.
     String targetFrameDescription = targetFrame.isLocalFrame() ? "with URL '" + toLocalFrame(targetFrame).document()->url().string() + "'" : "with origin '" + targetFrame.securityContext()->securityOrigin()->toString() + "'";
@@ skipping 505 matching lines @@
     , m_textZoomFactor(parentTextZoomFactor(this))
     , m_inViewSourceMode(false)
 {
     if (isLocalRoot())
         m_instrumentingAgents = InstrumentingAgents::create();
     else
         m_instrumentingAgents = localFrameRoot()->m_instrumentingAgents;
 }
 
 } // namespace blink