Fix the hasBackingFile flag for File backed by a file system URL.

Source/core/fileapi/File.cpp

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 132 matching lines @@
     , m_userVisibility(userVisibility)
     , m_path(metadata.platformPath)
     , m_name(name)
     , m_snapshotSize(metadata.length)
     , m_snapshotModificationTime(metadata.modificationTime)
 {
 }
 
 File::File(const KURL& fileSystemURL, const FileMetadata& metadata)
     : Blob(BlobDataHandle::create(createBlobDataForFileSystemURL(fileSystemURL, metadata), metadata.length))
-    , m_hasBackingFile(true)
+    , m_hasBackingFile(false)
     , m_userVisibility(File::IsNotUserVisible)
     , m_name(decodeURLEscapeSequences(fileSystemURL.lastPathComponent()))
     , m_fileSystemURL(fileSystemURL)
     , m_snapshotSize(metadata.length)
     , m_snapshotModificationTime(metadata.modificationTime)
 {
 }
 
 double File::lastModifiedMS() const
 {
@@ skipping 126 matching lines @@
     captureSnapshot(size, modificationTime);
     if (!m_fileSystemURL.isEmpty()) {
         blobData.appendFileSystemURL(m_fileSystemURL, 0, size, modificationTime);
         return;
     }
     ASSERT(!m_path.isEmpty());
     blobData.appendFile(m_path, 0, size, modificationTime);
 }
 
 } // namespace blink