Fail when uploading blob is non-existant

content/browser/blob_storage/chrome_blob_storage_context.h

 // Copyright (c) 2012 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_FILEAPI_CHROME_BLOB_STORAGE_CONTEXT_H_
 #define CONTENT_BROWSER_FILEAPI_CHROME_BLOB_STORAGE_CONTEXT_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 73 matching lines @@
   }
 };
 
 // Returns the BlobStorageContext associated with the
 // ChromeBlobStorageContext instance passed in.
 storage::BlobStorageContext* GetBlobStorageContext(
     ChromeBlobStorageContext* blob_storage_context);
 
 // Attaches blob data handles to the ResourceRequestBodyImpl body passed in.
 // This is used for POST and PUT requests.
-void AttachRequestBodyBlobDataHandles(ResourceRequestBodyImpl* body,
+bool AttachRequestBodyBlobDataHandles(ResourceRequestBodyImpl* body,
                                       ResourceContext* resource_context);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FILEAPI_CHROME_BLOB_STORAGE_CONTEXT_H_