[BlobAsync] Renderer support for blob file writing.

content/child/blob_storage/webblobregistry_impl.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_CHILD_BLOB_STORAGE_WEBBLOBREGISTRY_IMPL_H_
 #define CONTENT_CHILD_BLOB_STORAGE_WEBBLOBREGISTRY_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 74 matching lines @@
     void appendFileSystemURL(const blink::WebURL&,
                              uint64_t offset,
                              uint64_t length,
                              double expected_modification_time) override;
 
     void build() override;
 
    private:
     const std::string uuid_;
     const std::string content_type_;
-    std::unique_ptr<BlobConsolidation> consolidation_;
+    scoped_refptr<BlobConsolidation> consolidation_;
     scoped_refptr<ThreadSafeSender> sender_;
     scoped_refptr<base::SingleThreadTaskRunner> io_runner_;
     scoped_refptr<base::SingleThreadTaskRunner> main_runner_;
   };
 
   scoped_refptr<base::SingleThreadTaskRunner> io_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> main_runner_;
   scoped_refptr<ThreadSafeSender> sender_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_BLOB_STORAGE_WEBBLOBREGISTRY_IMPL_H_