Revert of [Blob] Fix for resetting reader.

content/browser/loader/upload_data_stream_builder.cc

 // Copyright 2013 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 "content/browser/loader/upload_data_stream_builder.h"
 
 #include <limits>
 #include <utility>
 #include <vector>
 
@@ skipping 84 matching lines @@
         element_readers.push_back(
             make_scoped_ptr(new content::UploadFileSystemFileElementReader(
                 file_system_context, element.filesystem_url(), element.offset(),
                 element.length(), element.expected_modification_time())));
         break;
       case ResourceRequestBody::Element::TYPE_BLOB: {
         DCHECK_EQ(std::numeric_limits<uint64_t>::max(), element.length());
         DCHECK_EQ(0ul, element.offset());
         scoped_ptr<storage::BlobDataHandle> handle =
             blob_context->GetBlobDataFromUUID(element.blob_uuid());
+        storage::BlobDataHandle* handle_ptr = handle.get();
         element_readers.push_back(
             make_scoped_ptr(new storage::UploadBlobElementReader(
-                std::move(handle), file_system_context, file_task_runner)));
+                handle_ptr->CreateReader(file_system_context, file_task_runner),
+                std::move(handle))));
         break;
       }
       case ResourceRequestBody::Element::TYPE_DISK_CACHE_ENTRY:
       case ResourceRequestBody::Element::TYPE_BYTES_DESCRIPTION:
       case ResourceRequestBody::Element::TYPE_UNKNOWN:
         NOTREACHED();
         break;
     }
   }
 
   return make_scoped_ptr(new net::ElementsUploadDataStream(
       std::move(element_readers), body->identifier()));
 }
 
 }  // namespace content