Update PPAPI IDL generator to define versioned structs, and unversioned typedef.

ppapi/native_client/tests/earth/pepper_c.c

Index: ppapi/native_client/tests/earth/pepper_c.c
diff --git a/ppapi/native_client/tests/earth/pepper_c.c b/ppapi/native_client/tests/earth/pepper_c.c
index 697675d8f8f2c75e76d3a5081f534b1a1e12f6dd..d43eb1ec044827adfdf3b427e484efb597dd8c77 100644
--- a/ppapi/native_client/tests/earth/pepper_c.c
+++ b/ppapi/native_client/tests/earth/pepper_c.c
@@ -42,10 +42,10 @@ PPB_GetInterface g_get_browser_interface = NULL;
  * Native Client.
  */
 struct PepperState {
-  const struct PPB_Core* core_interface;
-  const struct PPB_Graphics2D* graphics_2d_interface;
-  const struct PPB_ImageData* image_data_interface;
-  const struct PPB_Instance* instance_interface;
+  const PPB_Core* core_interface;
+  const PPB_Graphics2D* graphics_2d_interface;
+  const PPB_ImageData* image_data_interface;
+  const PPB_Instance* instance_interface;
   PP_Resource device_context;
   int32_t which_image;
   PP_Resource image[NUMBER_OF_IMAGES];
@@ -183,7 +183,7 @@ static PP_Bool Instance_HandleDocumentLoad(PP_Instance pp_instance,
   return PP_FALSE;
 }
 
-static struct PPP_Instance instance_interface = {
+static PPP_Instance instance_interface = {
   &Instance_DidCreate,
   &Instance_DidDestroy,
   &Instance_DidChangeView,
@@ -198,13 +198,13 @@ PP_EXPORT int32_t PPP_InitializeModule(PP_Module module,
                                        PPB_GetInterface get_browser_interface) {
   g_get_browser_interface = get_browser_interface;
 
-  g_MyState.core_interface = (const struct PPB_Core*)
+  g_MyState.core_interface = (const PPB_Core*)
     get_browser_interface(PPB_CORE_INTERFACE);
-  g_MyState.instance_interface = (const struct PPB_Instance*)
+  g_MyState.instance_interface = (const PPB_Instance*)
     get_browser_interface(PPB_INSTANCE_INTERFACE);
-  g_MyState.image_data_interface = (const struct PPB_ImageData*)
+  g_MyState.image_data_interface = (const PPB_ImageData*)
     get_browser_interface(PPB_IMAGEDATA_INTERFACE);
-  g_MyState.graphics_2d_interface = (const struct PPB_Graphics2D*)
+  g_MyState.graphics_2d_interface = (const PPB_Graphics2D*)
     get_browser_interface(PPB_GRAPHICS_2D_INTERFACE);
   if (!g_MyState.core_interface ||
       !g_MyState.instance_interface ||