Remove TransferFileFromRemoteToLocal, which are no longer used.

chrome/browser/chromeos/drive/dummy_file_system.h

Index: chrome/browser/chromeos/drive/dummy_file_system.h
diff --git a/chrome/browser/chromeos/drive/dummy_file_system.h b/chrome/browser/chromeos/drive/dummy_file_system.h
index c0fe93153117c25b6c0b7f5a7925b893745e7aa2..01eb4e76c467395cdb97fc5141405278df6dd75f 100644
--- a/chrome/browser/chromeos/drive/dummy_file_system.h
+++ b/chrome/browser/chromeos/drive/dummy_file_system.h
@@ -17,10 +17,6 @@ class DummyFileSystem : public FileSystemInterface {
   virtual void AddObserver(FileSystemObserver* observer) OVERRIDE {}
   virtual void RemoveObserver(FileSystemObserver* observer) OVERRIDE {}
   virtual void CheckForUpdates() OVERRIDE {}
-  virtual void TransferFileFromRemoteToLocal(
-      const base::FilePath& remote_src_file_path,
-      const base::FilePath& local_dest_file_path,
-      const FileOperationCallback& callback) OVERRIDE {}
   virtual void TransferFileFromLocalToRemote(
       const base::FilePath& local_src_file_path,
       const base::FilePath& remote_dest_file_path,