Delete FunctionGroupBase from Pepper.

ppapi/thunk/ppb_zoom_thunk.cc

 // 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.
 
 #include "ppapi/c/dev/ppb_zoom_dev.h"
 #include "ppapi/thunk/thunk.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_instance_api.h"
 
 namespace ppapi {
 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);
 }
 
 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);
   }
 }
 
 const PPB_Zoom_Dev g_ppb_zoom_thunk = {
   &ZoomChanged,
   &ZoomLimitsChanged
 };
 
 }  // namespace
 
 const PPB_Zoom_Dev_0_2* GetPPB_Zoom_Dev_0_2_Thunk() {
   return &g_ppb_zoom_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi