NaCl: Fix irt_shim_ppapi.c to compile with -Wstrict-prototypes

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3114
TEST=compile

Review URL: https://codereview.chromium.org/322443007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275510 0039d316-1c4b-4281-b951-d872f2087c98

ppapi/native_client/src/untrusted/pnacl_irt_shim/irt_shim_ppapi.c

@@ -33,7 +33,7 @@ static int32_t shim_PPPInitializeModule(PP_Module module_id,
       &__Pnacl_PPBGetInterface);
 }
 
-static void shim_PPPShutdownModule() {
+static void shim_PPPShutdownModule(void) {
   (*g_user_start_functions.PPP_ShutdownModule)();
 }