Unload all apps / extensions when deleting a profile.

chrome/browser/ui/browser.cc

 // Copyright 2012 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/ui/browser.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #endif  // defined(OS_WIN)
@@ skipping 427 matching lines @@
     // Notify PDM that this is a first run.
     ImportAutofillDataWin(
         autofill::PersonalDataManagerFactory::GetForProfile(profile_));
 #endif  // defined(OS_WIN)
   }
 
   fullscreen_controller_.reset(new FullscreenController(this));
 }
 
 Browser::~Browser() {
+  // Stop observing notifications before continuing with destruction. Profile
+  // destruction will unload extensions and reentrant calls to Browser:: should
+  // be avoided while it is being torn down.
+  registrar_.RemoveAll();
+
   // The tab strip should not have any tabs at this point.
   DCHECK(tab_strip_model_->empty());
   tab_strip_model_->RemoveObserver(this);
 
   // Destroy the BrowserCommandController before removing the browser, so that
   // it doesn't act on any notifications that are sent as a result of removing
   // the browser.
   command_controller_.reset();
   BrowserList::RemoveBrowser(this);
 
@@ skipping 1956 matching lines @@
   if (contents && !allow_js_access) {
     contents->web_contents()->GetController().LoadURL(
         target_url,
         content::Referrer(),
         content::PAGE_TRANSITION_LINK,
         std::string());  // No extra headers.
   }
 
   return contents != NULL;
 }