Fix crash during profile shutdown

chrome/browser/profiles/profile_impl.cc

 // Copyright (c) 2011 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_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/environment.h"
@@ skipping 214 matching lines @@
 
 ProfileImpl::ProfileImpl(const FilePath& path,
                          Profile::Delegate* delegate)
     : path_(path),
       ALLOW_THIS_IN_INITIALIZER_LIST(visited_link_event_listener_(
           new VisitedLinkEventListener(this))),
       ALLOW_THIS_IN_INITIALIZER_LIST(io_data_(this)),
       extension_devtools_manager_(NULL),
       host_content_settings_map_(NULL),
       host_zoom_map_(NULL),
+      profile_sync_service_created_(false),
       history_service_created_(false),
       favicon_service_created_(false),
       created_web_data_service_(false),
       created_password_store_(false),
       start_time_(Time::Now()),
 #if defined(OS_WIN)
       checked_instant_promo_(false),
 #endif
       delegate_(delegate),
       predictor_(NULL),
@@ skipping 1135 matching lines @@
   }
 #endif
   return GetProfileSyncService("");
 }
 
 ProfileSyncService* ProfileImpl::GetProfileSyncService(
     const std::string& cros_user) {
 
   if (!ProfileSyncService::IsSyncEnabled())
     return NULL;
-  if (!sync_service_.get())
+  if (!profile_sync_service_created_) {
+    profile_sync_service_created_ = true;
     InitSyncService(cros_user);
+  }
   return sync_service_.get();
 }
 
 void ProfileImpl::InitSyncService(const std::string& cros_user) {
   profile_sync_factory_.reset(
       new ProfileSyncComponentsFactoryImpl(this,
                                            CommandLine::ForCurrentProcess()));
   sync_service_.reset(
       profile_sync_factory_->CreateProfileSyncService(cros_user));
   profile_sync_factory_->RegisterDataTypes(sync_service_.get());
@@ skipping 236 matching lines @@
                                      FilePath* cache_path,
                                      int* max_size) {
   DCHECK(cache_path);
   DCHECK(max_size);
   FilePath path(prefs_->GetFilePath(prefs::kDiskCacheDir));
   if (!path.empty())
     *cache_path = path;
   *max_size = is_media_context ? prefs_->GetInteger(prefs::kMediaCacheSize) :
                                  prefs_->GetInteger(prefs::kDiskCacheSize);
 }