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 c7409667aa5d47c1e288ef6f97ded0c910c0faa0..f188e60f8d6c0c1f6c776eca15b8587f7dc468ae 100644
--- a/content/browser/download/download_file_manager.h
+++ b/content/browser/download/download_file_manager.h
@@ -50,6 +50,7 @@
 #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"
@@ -62,7 +63,6 @@ class FilePath;
 
 namespace content {
 class ByteStreamReader;
-class DownloadFile;
 class DownloadId;
 class DownloadManager;
 }
@@ -83,7 +83,8 @@ class CONTENT_EXPORT DownloadFileManager
       CreateDownloadFileCallback;
 
   // Callback used with RenameDownloadFile().
-  typedef base::Callback<void(const FilePath&)> RenameCompletionCallback;
+  typedef content::DownloadFile::RenameCompletionCallback
+      RenameCompletionCallback;
 
   class DownloadFileFactory {
    public: