Fix and refactor downloaded file handling in the loading stack

content/browser/loader/resource_dispatcher_host_impl.h

Index: content/browser/loader/resource_dispatcher_host_impl.h
diff --git a/content/browser/loader/resource_dispatcher_host_impl.h b/content/browser/loader/resource_dispatcher_host_impl.h
index 435b0ee13cee81ead80e1cdafc55a0deda33481d..f2caa5e2ed7b4093d546546eeb671fffd9ebdade 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.h
+++ b/content/browser/loader/resource_dispatcher_host_impl.h
@@ -48,13 +48,10 @@ namespace base {
 class FilePath;
 }
 
-namespace storage {
-class ShareableFileReference;
-}
-
 namespace content {
 class AppCacheService;
 class AsyncRevalidationManager;
+class DownloadedTempFileImpl;
 class LoaderDelegate;
 class NavigationURLLoaderImplCore;
 class NavigationUIData;
@@ -214,8 +211,7 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
   // child process and to defer deletion of the file until it's
   // no longer needed.
   void RegisterDownloadedTempFile(
-      int child_id, int request_id,
-      const base::FilePath& file_path);
+      std::unique_ptr<DownloadedTempFileImpl> downloaded_temp_file);
   void UnregisterDownloadedTempFile(int child_id, int request_id);
 
   // Needed for the sync IPC message dispatcher macros.
@@ -686,7 +682,7 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
   // Collection of temp files downloaded for child processes via
   // the download_to_file mechanism. We avoid deleting them until
   // the client no longer needs them.
-  typedef std::map<int, scoped_refptr<storage::ShareableFileReference> >
+  typedef std::map<int, std::unique_ptr<DownloadedTempFileImpl>>
       DeletableFilesMap;  // key is request id
   typedef std::map<int, DeletableFilesMap>
       RegisteredTempFiles;  // key is child process id