Add version-specific defines for each C interface.

ppapi/c/dev/ppb_char_set_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_CHAR_SET_DEV_H_
 #define PPAPI_C_DEV_PPB_CHAR_SET_DEV_H_
 
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/c/pp_var.h"
 
-#define PPB_CHAR_SET_DEV_INTERFACE "PPB_CharSet(Dev);0.4"
+#define PPB_CHAR_SET_DEV_INTERFACE_0_4 "PPB_CharSet(Dev);0.4"
+#define PPB_CHAR_SET_DEV_INTERFACE PPB_CHAR_SET_DEV_INTERFACE_0_4
 
 // Specifies the error behavior for the character set conversion functions.
 // This will affect two cases: where the input is not encoded correctly, and
 // when the requested character can not be converted to the destination
 // character set.
 enum PP_CharSet_ConversionError {
   // Causes the entire conversion to fail if an error is encountered. The
   // conversion function will return NULL.
   PP_CHARSET_CONVERSIONERROR_FAIL,
 
@@ skipping 50 matching lines @@
   // the current system.
   //
   // WARNING: You really shouldn't be using this function unless you're dealing
   // with legacy data. You should be using UTF-8 or UTF-16 and you don't have
   // to worry about the character sets.
   struct PP_Var (*GetDefaultCharSet)(PP_Instance instance);
 };
 
 #endif  /* PPAPI_C_DEV_PPB_CHAR_SET_DEV_H_ */