Clean up the file dev interfaces. The combination of some dev and some non

ppapi/cpp/dev/file_chooser_dev.h

 // Copyright (c) 2010 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 PPAPI_CPP_DEV_FILE_CHOOSER_DEV_H_
 #define PPAPI_CPP_DEV_FILE_CHOOSER_DEV_H_
 
 #include "ppapi/cpp/resource.h"
 
 struct PP_FileChooserOptions_Dev;
 
 namespace pp {
 
 class CompletionCallback;
-class FileRef_Dev;
+class FileRef;
 class Instance;
 
 class FileChooser_Dev : public Resource {
  public:
   // Creates an is_null() FileChooser object.
   FileChooser_Dev() {}
 
   FileChooser_Dev(const Instance& instance,
                   const PP_FileChooserOptions_Dev& options);
 
   FileChooser_Dev(const FileChooser_Dev& other);
 
   // PPB_FileChooser methods:
   int32_t Show(const CompletionCallback& cc);
-  FileRef_Dev GetNextChosenFile() const;
+  FileRef GetNextChosenFile() const;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_FILE_CHOOSER_DEV_H_