Move Rename functionality from DownloadFileManager to DownloadFileImple.

content/browser/download/download_file_manager.h

Index: content/browser/download/download_file_manager.h
diff --git a/content/browser/download/download_file_manager.h b/content/browser/download/download_file_manager.h
index bf2a53ed5ca91e1a93a8ce9a91a1f1b7b1284e09..919f1c4c458b6ba084b5700826e4579841286491 100644
--- a/content/browser/download/download_file_manager.h
+++ b/content/browser/download/download_file_manager.h
@@ -49,6 +49,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/timer.h"
+#include "content/browser/download/download_file.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/download_id.h"
 #include "content/public/browser/download_interrupt_reasons.h"
@@ -61,7 +62,6 @@ class FilePath;
 
 namespace content {
 class ByteStreamReader;
-class DownloadFile;
 class DownloadId;
 class DownloadManager;
 }
@@ -82,7 +82,8 @@ class CONTENT_EXPORT DownloadFileManager
       CreateDownloadFileCallback;
 
   // Callback used with RenameDownloadFile().
-  typedef base::Callback<void(const FilePath&)> RenameCompletionCallback;
+  typedef content::DownloadFile::RenameCompletionCallback
+      RenameCompletionCallback;
 
   class DownloadFileFactory {
    public: