Add request header on gdata operation for testing ETag match.

chrome/browser/chromeos/drive/file_system/remove_operation.cc

 // 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.
 
 #include "chrome/browser/chromeos/drive/file_system/remove_operation.h"
 
 #include "chrome/browser/chromeos/drive/drive.pb.h"
 #include "chrome/browser/chromeos/drive/drive_cache.h"
 #include "chrome/browser/chromeos/drive/drive_file_system_util.h"
 #include "chrome/browser/chromeos/drive/file_system/operation_observer.h"
@@ skipping 49 matching lines @@
   DCHECK(entry_proto.get());
 
   // The edit URL can be empty for some reason.
   if (entry_proto->edit_url().empty()) {
     callback.Run(DRIVE_FILE_ERROR_NOT_FOUND);
     return;
   }
 
   drive_service_->DeleteDocument(
       GURL(entry_proto->edit_url()),
+      std::string(),  // ETag
       base::Bind(&RemoveOperation::RemoveResourceLocally,
                  weak_ptr_factory_.GetWeakPtr(),
                  callback,
                  entry_proto->resource_id()));
 }
 
 void RemoveOperation::RemoveResourceLocally(
     const FileOperationCallback& callback,
     const std::string& resource_id,
     gdata::GDataErrorCode status,
@@ skipping 22 matching lines @@
     const FilePath& directory_path) {
   if (error == DRIVE_FILE_OK)
     observer_->OnDirectoryChangedByOperation(directory_path);
 
   if (!callback.is_null())
     callback.Run(error);
 }
 
 }  // namespace file_system
 }  // namespace drive