Another attempt at landing this....

chrome/browser/external_tab_container.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/external_tab_container.h"
 
 #include <string>
 
 #include "app/l10n_util.h"
 #include "app/win_util.h"
 #include "base/logging.h"
 #include "base/win_util.h"
 #include "chrome/browser/automation/automation_provider.h"
 #include "chrome/browser/browser_window.h"
+#include "chrome/browser/debugger/devtools_manager.h"
 #include "chrome/browser/load_notification_details.h"
 #include "chrome/browser/page_info_window.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/tab_contents/provisional_load_details.h"
 #include "chrome/browser/views/tab_contents/render_view_context_menu_external_win.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/browser/views/tab_contents/tab_contents_container.h"
 #include "chrome/common/bindings_policy.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/notification_service.h"
@@ skipping 126 matching lines @@
   ::ShowWindow(tab_contents_->GetNativeView(), SW_SHOWNA);
 
   disabled_context_menu_ids_.push_back(
       IDS_CONTENT_CONTEXT_OPENLINKOFFTHERECORD);
   return true;
 }
 
 void ExternalTabContainer::Uninitialize() {
   registrar_.RemoveAll();
   if (tab_contents_) {
+    RenderViewHost* rvh = tab_contents_->render_view_host();
+    if (rvh && DevToolsManager::GetInstance()) {
+      DevToolsManager::GetInstance()->UnregisterDevToolsClientHostFor(rvh);
+    }
+
     NotificationService::current()->Notify(
         NotificationType::EXTERNAL_TAB_CLOSED,
         Source<NavigationController>(&tab_contents_->controller()),
         Details<ExternalTabContainer>(this));
 
     delete tab_contents_;
     tab_contents_ = NULL;
   }
 }
 
@@ skipping 454 matching lines @@
 
 void ExternalTabContainer::Navigate(const GURL& url, const GURL& referrer) {
   if (!tab_contents_) {
     NOTREACHED();
     return;
   }
 
   tab_contents_->controller().LoadURL(url, referrer,
                                       PageTransition::START_PAGE);
 }