[BlobAsync] Renderer support for blob file writing.

content/child/webblobregistry_impl.h

Index: content/child/webblobregistry_impl.h
diff --git a/content/child/webblobregistry_impl.h b/content/child/webblobregistry_impl.h
index 474e9b8305581390566e9f22b0a3001cd59a30ad..601fded9dc33ddaf8437e90de623c05b194704ab 100644
--- a/content/child/webblobregistry_impl.h
+++ b/content/child/webblobregistry_impl.h
@@ -92,7 +92,7 @@ class WebBlobRegistryImpl : public blink::WebBlobRegistry {
    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_;