Reverting this as it causes browser tests on the Linux ChromiumOS builder to fail.

chrome/browser/profiles/profile_io_data.cc

 // Copyright (c) 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/profiles/profile_io_data.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 342 matching lines @@
     context = app_request_context_map_[app_id];
   } else {
     context = AcquireIsolatedAppRequestContext(main_context, app_id);
     app_request_context_map_[app_id] = context;
   }
   DCHECK(context);
   return context;
 }
 
 ExtensionInfoMap* ProfileIOData::GetExtensionInfoMap() const {
-  DCHECK(extension_info_map_) << "ExtensionSystem not initialized";
   return extension_info_map_;
 }
 
 CookieSettings* ProfileIOData::GetCookieSettings() const {
   return cookie_settings_;
 }
 
 #if defined(ENABLE_NOTIFICATIONS)
 DesktopNotificationService* ProfileIOData::GetNotificationService() const {
   return notification_service_;
@@ skipping 226 matching lines @@
 }
 
 void ProfileIOData::set_server_bound_cert_service(
     net::ServerBoundCertService* server_bound_cert_service) const {
   server_bound_cert_service_.reset(server_bound_cert_service);
 }
 
 void ProfileIOData::DestroyResourceContext() {
   resource_context_.reset();
 }