Check if the delegate in WebContents::CanTerminate is valid...

chrome/browser/web_contents.cc

 // Copyright (c) 2006-2008 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 "chrome/browser/web_contents.h"
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/file_version_info.h"
 #include "base/process_util.h"
@@ skipping 1324 matching lines @@
 }
 
 void WebContents::OnEnterOrSpace() {
   // See comment in RenderViewHostDelegate::OnEnterOrSpace as to why we do this.
   DownloadRequestManager* drm = g_browser_process->download_request_manager();
   if (drm)
     drm->OnUserGesture(this);
 }
 
 bool WebContents::CanTerminate() const {
+  if (!delegate())
+    return true;
+
   return !delegate()->IsExternalTabContainer();
 }
 
 void WebContents::FileSelected(const std::wstring& path, void* params) {
   render_view_host()->FileSelected(path);
 }
 
 void WebContents::FileSelectionCanceled(void* params) {
   // If the user cancels choosing a file to upload we need to pass back the
   // empty string.
   render_view_host()->FileSelected(std::wstring());
 }
 
 void WebContents::BeforeUnloadFiredFromRenderManager(
     bool proceed,
     bool* proceed_to_fire_unload) {
-  delegate()->BeforeUnloadFired(this, proceed, proceed_to_fire_unload);
+  if (delegate())
+    delegate()->BeforeUnloadFired(this, proceed, proceed_to_fire_unload);
 }
 
 void WebContents::UpdateRenderViewSizeForRenderManager() {
   // TODO(brettw) this is a hack. See WebContentsView::SizeContents.
   view_->SizeContents(view_->GetContainerSize());
 }
 
 bool WebContents::CreateRenderViewForRenderManager(
     RenderViewHost* render_view_host) {
   RenderWidgetHostView* rvh_view = view_->CreateViewForWidget(render_view_host);
@@ skipping 400 matching lines @@
     // The favicon url isn't valid. This means there really isn't a favicon,
     // or the favicon url wasn't obtained before the load started. This assumes
     // the later.
     // TODO(sky): Need a way to set the favicon that doesn't involve generating
     // its url.
     new_url->SetFavIconURL(TemplateURL::GenerateFaviconURL(params.referrer));
   }
   new_url->set_safe_for_autoreplace(true);
   url_model->Add(new_url);
 }