ppapi: Make 0.4 the default for PPP_Printing_Dev, leave backwards-compat

ppapi/native_client/src/trusted/plugin/plugin.cc

Index: ppapi/native_client/src/trusted/plugin/plugin.cc
diff --git a/ppapi/native_client/src/trusted/plugin/plugin.cc b/ppapi/native_client/src/trusted/plugin/plugin.cc
index 1fdf44924d464a0ece281ba3d979b165a453ff03..b262874d4ca193c71bfd9052bebb10b1fa2fee91 100644
--- a/ppapi/native_client/src/trusted/plugin/plugin.cc
+++ b/ppapi/native_client/src/trusted/plugin/plugin.cc
@@ -310,14 +310,11 @@ class PrintingAdapter : public pp::Printing_Dev {
         proxy->GetPluginInterface(PPP_PRINTING_DEV_INTERFACE));
   }
 
-  PP_PrintOutputFormat_Dev*
-      QuerySupportedPrintOutputFormats(uint32_t* format_count) {
+  uint32_t QuerySupportedPrintOutputFormats() {
     if (ppp_printing_ != NULL) {
-      return ppp_printing_->QuerySupportedFormats(plugin_->pp_instance(),
-                                                  format_count);
+      return ppp_printing_->QuerySupportedFormats(plugin_->pp_instance());
     }
-    *format_count = 0;
-    return NULL;
+    return 0;
   }
 
   int32_t PrintBegin(const PP_PrintSettings_Dev& print_settings) {