Fix some issues with extension messaging:

webkit/glue/webview_impl.cc

 /*
 * Copyright 2007 Google Inc. All Rights Reserved.
 *
 * Portions Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
 *
 * ***** BEGIN LICENSE BLOCK *****
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
@@ skipping 889 matching lines @@
   // frames in the tree, calling each frame's onbeforeunload.  At the moment,
   // we're consistent with Safari 3.1, not IE/FF.
   Frame* frame = page_->focusController()->focusedOrMainFrame();
   if (!frame)
     return true;
 
   return frame->shouldClose();
 }
 
 void WebViewImpl::Close() {
-  // Do this first to prevent reentrant notifications from being sent to the
-  // initiator of the close.
-  delegate_ = NULL;
-
   if (page_.get()) {
     // Initiate shutdown for the entire frameset.  This will cause a lot of
     // notifications to be sent.
     if (page_->mainFrame())
       page_->mainFrame()->loader()->frameDetached();
     page_.reset();
   }
 
   // Should happen after page_.reset().
   if (devtools_agent_.get())
     devtools_agent_.reset(NULL);
 
+  // Do this first to prevent reentrant notifications from being sent to the
+  // initiator of the close.
+  delegate_ = NULL;
+
   Release();  // Balances AddRef from WebView::Create
 }
 
 WebViewDelegate* WebViewImpl::GetDelegate() {
   return delegate_;
 }
 
 void WebViewImpl::SetDelegate(WebViewDelegate* delegate) {
   delegate_ = delegate;
 }
@@ skipping 1005 matching lines @@
 
   return document->focusedNode();
 }
 
 HitTestResult WebViewImpl::HitTestResultForWindowPos(const IntPoint& pos) {
   IntPoint doc_point(
       page_->mainFrame()->view()->windowToContents(pos));
   return page_->mainFrame()->eventHandler()->
       hitTestResultAtPoint(doc_point, false);
 }