Add version-specific defines for each C interface.

ppapi/c/dev/ppb_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_C_DEV_PPB_FILE_CHOOSER_DEV_H_
 #define PPAPI_C_DEV_PPB_FILE_CHOOSER_DEV_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
@@ skipping 13 matching lines @@
 
   // A comma-separated list of MIME types such as audio/*,text/plain.  The
   // dialog may restrict selectable files to the specified MIME types. Null may
   // be given to indicate that all types should be accepted.
   // TODO(darin): What if the mime type is unknown to the system?  The plugin
   // may wish to describe the mime type and provide a matching file extension.
   // It is more webby to use mime types here instead of file extensions.
   const char* accept_mime_types;
 };
 
-#define PPB_FILECHOOSER_DEV_INTERFACE "PPB_FileChooser(Dev);0.3"
+#define PPB_FILECHOOSER_DEV_INTERFACE_0_3 "PPB_FileChooser(Dev);0.3"
+#define PPB_FILECHOOSER_DEV_INTERFACE PPB_FILECHOOSER_DEV_INTERFACE_0_3
 
 struct PPB_FileChooser_Dev {
   // Creates a file chooser dialog with the specified options.  The chooser is
   // associated with a particular instance, so that it may be positioned on the
   // screen relative to the tab containing the instance.  Returns 0 if passed
   // an invalid instance.
   //
   // A PPB_FileChooser_Dev instance can be used to select a single file
   // (PP_FILECHOOSERMODE_OPEN) or multiple files
   // (PP_FILECHOOSERMODE_OPENMULTIPLE). Unlike the HTML5 <input type="file">
@@ skipping 16 matching lines @@
   // chosen files.  It should be called in a loop until it returns 0.
   // Depending on the PP_ChooseFileMode requested when the FileChooser was
   // created, the file refs will either be readable or writable.  Their file
   // system type will be PP_FileSystemType_External.  If the user chose no
   // files or cancelled the dialog, then this method will simply return 0
   // the first time it is called.
   PP_Resource (*GetNextChosenFile)(PP_Resource chooser);
 };
 
 #endif  /* PPAPI_C_DEV_PPB_FILE_CHOOSER_DEV_H_ */