Fix history importing by delaying DownloadManager creation.

chrome/browser/download/download_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SERVICE_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SERVICE_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 
 class ChromeDownloadManagerDelegate;
 class DownloadManager;
 class Profile;
+class DownloadIdFactory;
 
 // Owning class for DownloadManager (content) and
 // ChromeDownloadManagerDelegate (chrome)
 class DownloadService : public ProfileKeyedService {
  public:
   explicit DownloadService(Profile* profile);
   virtual ~DownloadService();
 
+  DownloadIdFactory* GetDownloadIdFactory() const;
+
   // Get the download manager.  Creates the download manager if
   // it does not already exist.
   DownloadManager* GetDownloadManager();
 
   // Has a download manager been created?  (By calling above function.)
   bool HasCreatedDownloadManager();
 
   // Number of downloads associated with this instance of the service.
   int DownloadCount() const;
 
   // Number of downloads associated with all profiles.
   static int DownloadCountAllProfiles();
 
   // Sets the DownloadManagerDelegate associated with this object and
   // its DownloadManager.  Takes ownership of |delegate|, and destroys
   // the previous delegate.  For testing.
   void SetDownloadManagerDelegateForTesting(
       ChromeDownloadManagerDelegate* delegate);
 
   // Will be called to release references on other services as part
   // of Profile shutdown.
   virtual void Shutdown() OVERRIDE;
 
  private:
+  scoped_refptr<DownloadIdFactory> id_factory_;
+
   bool download_manager_created_;
   Profile* profile_;
 
   // Both of these objects are owned by this class.
   // DownloadManager is RefCountedThreadSafe because of references
   // from DownloadFile objects on the FILE thread, and may need to be
   // kept alive until those objects are deleted.
   // ChromeDownloadManagerDelegate may be the target of callbacks from
   // the history service/DB thread and must be kept alive for those
   // callbacks.
   scoped_refptr<DownloadManager> manager_;
   scoped_refptr<ChromeDownloadManagerDelegate> manager_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadService);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SERVICE_H_