drive: Discard upload location when there is no uploaded contents

chrome/browser/drive/drive_uploader.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_DRIVE_DRIVE_UPLOADER_H_
 #define CHROME_BROWSER_DRIVE_DRIVE_UPLOADER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 154 matching lines @@
   // DriveService callback for InitiateUpload.
   void OnUploadLocationReceived(scoped_ptr<UploadFileInfo> upload_file_info,
                                 google_apis::GDataErrorCode code,
                                 const GURL& upload_location);
 
   // Starts to get the current upload status for the file uploading.
   // Upon completion, OnUploadRangeResponseReceived should be called.
   void StartGetUploadStatus(scoped_ptr<UploadFileInfo> upload_file_info);
 
   // Uploads the next chunk of data from the file.
-  void UploadNextChunk(scoped_ptr<UploadFileInfo> upload_file_info,
-                       int64 start_position);
+  void UploadNextChunk(scoped_ptr<UploadFileInfo> upload_file_info);
 
   // DriveService callback for ResumeUpload.
   void OnUploadRangeResponseReceived(
       scoped_ptr<UploadFileInfo> upload_file_info,
       const google_apis::UploadRangeResponse& response,
       scoped_ptr<google_apis::ResourceEntry> entry);
   void OnUploadProgress(const google_apis::ProgressCallback& callback,
                         int64 start_position,
                         int64 total_size,
                         int64 progress_of_chunk,
@@ skipping 11 matching lines @@
 
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<DriveUploader> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(DriveUploader);
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_DRIVE_DRIVE_UPLOADER_H_