Remove TransferFileFromRemoteToLocal, which are no longer used.

chrome/browser/chromeos/drive/fake_file_system.cc

Index: chrome/browser/chromeos/drive/fake_file_system.cc
diff --git a/chrome/browser/chromeos/drive/fake_file_system.cc b/chrome/browser/chromeos/drive/fake_file_system.cc
index 6211872d9fdddaf7f649fc8ca4e0dc6b15add522..40fbd29920b168a9f8d6429b2a20f2342f397dc1 100644
--- a/chrome/browser/chromeos/drive/fake_file_system.cc
+++ b/chrome/browser/chromeos/drive/fake_file_system.cc
@@ -54,13 +54,6 @@ void FakeFileSystem::CheckForUpdates() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 }
 
-void FakeFileSystem::TransferFileFromRemoteToLocal(
-    const base::FilePath& remote_src_file_path,
-    const base::FilePath& local_dest_file_path,
-    const FileOperationCallback& callback) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-}
-
 void FakeFileSystem::TransferFileFromLocalToRemote(
     const base::FilePath& local_src_file_path,
     const base::FilePath& remote_dest_file_path,