Move SetUserData of BlobDataHandles from UploadDataStreamBuilder to ResourceDispatcherHostImpl.

content/browser/loader/upload_data_stream_builder.h

 // 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.
 
 #ifndef CONTENT_BROWSER_LOADER_UPLOAD_DATA_STREAM_BUILDER_H_
 #define CONTENT_BROWSER_LOADER_UPLOAD_DATA_STREAM_BUILDER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
 
@@ skipping 14 matching lines @@
 }
 
 namespace content {
 
 class ResourceRequestBody;
 
 class CONTENT_EXPORT UploadDataStreamBuilder {
  public:
   // Creates a new UploadDataStream from this request body.
   //
-  // This also resolves any blob references using the given |blob_context|
-  // and binds those blob references to the ResourceRequestBody ensuring that
-  // the blob data remains valid for the lifetime of the ResourceRequestBody
-  // object.
+  // If |body| contains any blob references, the caller is responsible for
+  // making sure them outlive the returned value of UploadDataStream. We do this
+  // by binding the BlobDataHandles of them to ResourceRequestBody in
+  // ResourceDispatcherHostImpl::BeginRequest().
   //
   // |file_system_context| is used to create a FileStreamReader for files with
   // filesystem URLs.  |file_task_runner| is used to perform file operations
   // when the data gets uploaded.
   static scoped_ptr<net::UploadDataStream> Build(
       ResourceRequestBody* body,
       storage::BlobStorageContext* blob_context,
       storage::FileSystemContext* file_system_context,
       base::TaskRunner* file_task_runner);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_UPLOAD_DATA_STREAM_BUILDER_H_