Failure in reading Blob URL should results in network error

third_party/WebKit/Source/core/fileapi/FileReaderLoader.cpp

 /*
  * Copyright (C) 2010 Google Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 255 matching lines @@
 }
 
 void FileReaderLoader::DidFail(const ResourceError& error) {
   if (error.IsCancellation())
     return;
   // If we're aborting, do not proceed with normal error handling since it is
   // covered in aborting code.
   if (error_code_ == FileError::kAbortErr)
     return;
 
+  if (error.IsFileNotFoundError()) {
+    Failed(FileError::kNotFoundErr);
+    return;
+  }
+
   Failed(FileError::kNotReadableErr);
 }
 
 void FileReaderLoader::Failed(FileError::ErrorCode error_code) {
   error_code_ = error_code;
   Cleanup();
   if (client_)
     client_->DidFail(error_code_);
 }
 
@@ skipping 109 matching lines @@
 
   return builder.ToString();
 }
 
 void FileReaderLoader::SetEncoding(const String& encoding) {
   if (!encoding.IsEmpty())
     encoding_ = WTF::TextEncoding(encoding);
 }
 
 }  // namespace blink