Implement File constructor.

Source/core/fileapi/FileReader.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 36 matching lines @@
 namespace {
 
 #if !LOG_DISABLED
 const CString utf8BlobUUID(Blob* blob)
 {
     return blob->uuid().utf8();
 }
 
 const CString utf8FilePath(Blob* blob)
 {
-    return blob->isFile() ? toFile(blob)->path().utf8() : "";
+    return blob->hasBackingFile() ? toFile(blob)->path().utf8() : "";
 }
 #endif
 
 } // namespace
 
 static const double progressNotificationIntervalMS = 50;
 
 PassRefPtr<FileReader> FileReader::create(ExecutionContext* context)
 {
     RefPtr<FileReader> fileReader(adoptRef(new FileReader(context)));
@@ skipping 217 matching lines @@
 }
 
 String FileReader::stringResult()
 {
     if (!m_loader || m_error)
         return String();
     return m_loader->stringResult();
 }
 
 } // namespace WebCore