Delete FunctionGroupBase from Pepper.

ppapi/thunk/ppb_zoom_thunk.cc

Index: ppapi/thunk/ppb_zoom_thunk.cc
diff --git a/ppapi/thunk/ppb_zoom_thunk.cc b/ppapi/thunk/ppb_zoom_thunk.cc
index 7ea903c2e94ece1ed2708f6130806554ab445bd8..193e856e12c0eb050e0eef44842805f5ff21a817 100644
--- a/ppapi/thunk/ppb_zoom_thunk.cc
+++ b/ppapi/thunk/ppb_zoom_thunk.cc
@@ -13,7 +13,7 @@ namespace thunk {
 namespace {
 
 void ZoomChanged(PP_Instance instance, double factor) {
-  EnterFunction<PPB_Instance_FunctionAPI> enter(instance, true);
+  EnterInstance enter(instance);
   if (enter.succeeded())
     enter.functions()->ZoomChanged(instance, factor);
 }
@@ -21,7 +21,7 @@ void ZoomChanged(PP_Instance instance, double factor) {
 void ZoomLimitsChanged(PP_Instance instance,
                        double minimum_factor,
                        double maximum_factor) {
-  EnterFunction<PPB_Instance_FunctionAPI> enter(instance, true);
+  EnterInstance enter(instance);
   if (enter.succeeded()) {
     enter.functions()->ZoomLimitsChanged(instance,
                                          minimum_factor, maximum_factor);