[BlobStorage] Fix IPC race in sending IPC and posting to IO thread

content/child/blob_storage/blob_transport_controller.h

Index: content/child/blob_storage/blob_transport_controller.h
diff --git a/content/child/blob_storage/blob_transport_controller.h b/content/child/blob_storage/blob_transport_controller.h
index c9c62ce55ba69e36a4b5bcd6f7ddcc52c421057e..cfd7af3250984473623587f9ecd5427359722e0f 100644
--- a/content/child/blob_storage/blob_transport_controller.h
+++ b/content/child/blob_storage/blob_transport_controller.h
@@ -110,6 +110,13 @@ class CONTENT_EXPORT BlobTransportController {
   };
   friend struct base::DefaultLazyInstanceTraits<BlobTransportController>;
 
+  static void InitiateBlobTransferOnIOThread(
+      const std::string& uuid,
+      const std::string& content_type,
+      std::unique_ptr<BlobConsolidation> consolidation,
+      scoped_refptr<ThreadSafeSender> sender,
+      scoped_refptr<base::SingleThreadTaskRunner> main_runner);
+
   void StoreBlobDataForRequests(
       const std::string& uuid,
       std::unique_ptr<BlobConsolidation> consolidation,