Make PPAPI headers compilable with -Wstrict-prototypes

ppapi/c/private/ppb_gpu_blacklist_private.h

 /* Copyright (c) 2012 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.
  */
 
 /* From private/ppb_gpu_blacklist_private.idl,
- *   modified Wed Oct 10 15:34:44 2012.
+ *   modified Wed Oct 24 14:41:20 2012.
  */
 
 #ifndef PPAPI_C_PRIVATE_PPB_GPU_BLACKLIST_PRIVATE_H_
 #define PPAPI_C_PRIVATE_PPB_GPU_BLACKLIST_PRIVATE_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_macros.h"
 
 #define PPB_GPUBLACKLIST_PRIVATE_INTERFACE_0_2 "PPB_GpuBlacklist_Private;0.2"
 #define PPB_GPUBLACKLIST_PRIVATE_INTERFACE \
@@ skipping 12 matching lines @@
 struct PPB_GpuBlacklist_Private_0_2 {
   /**
    * Returns true if the current system's GPU is blacklisted and 3D in Chrome
    * will be emulated via software rendering.
    *
    * This is used internally by the SRPC NaCl proxy (not exposed to plugins) to
    * determine if the 3D interfaces should be exposed to plugins. We don't
    * expose the 3D interfaces if the 3D support is software-emulated. When the
    * SRPC proxy is removed, this interface can also be removed.
    */
-  PP_Bool (*IsGpuBlacklisted)();
+  PP_Bool (*IsGpuBlacklisted)(void);
 };
 
 typedef struct PPB_GpuBlacklist_Private_0_2 PPB_GpuBlacklist_Private;
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PRIVATE_PPB_GPU_BLACKLIST_PRIVATE_H_ */