Fix history importing by delaying DownloadManager creation.

chrome/browser/download/download_service.h

Index: chrome/browser/download/download_service.h
diff --git a/chrome/browser/download/download_service.h b/chrome/browser/download/download_service.h
index 2cc65706f09b5324f90b5e168156ed945f132f21..2317de1a92bf7b374874c72e6d641b02575f3455 100644
--- a/chrome/browser/download/download_service.h
+++ b/chrome/browser/download/download_service.h
@@ -14,6 +14,7 @@
 class ChromeDownloadManagerDelegate;
 class DownloadManager;
 class Profile;
+class DownloadIdFactory;
 
 // Owning class for DownloadManager (content) and
 // ChromeDownloadManagerDelegate (chrome)
@@ -22,6 +23,8 @@ class DownloadService : public ProfileKeyedService {
   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();
@@ -46,6 +49,8 @@ class DownloadService : public ProfileKeyedService {
   virtual void Shutdown() OVERRIDE;
 
  private:
+  scoped_refptr<DownloadIdFactory> id_factory_;
+
   bool download_manager_created_;
   Profile* profile_;