Delete FunctionGroupBase from Pepper.

ppapi/thunk/ppb_fullscreen_thunk.cc

Index: ppapi/thunk/ppb_fullscreen_thunk.cc
diff --git a/ppapi/thunk/ppb_fullscreen_thunk.cc b/ppapi/thunk/ppb_fullscreen_thunk.cc
index b2419385ef07d346fad99e11ffce5758579f18c6..d8904f2c1451344e0a9d6aaf402c22ce50f52cf2 100644
--- a/ppapi/thunk/ppb_fullscreen_thunk.cc
+++ b/ppapi/thunk/ppb_fullscreen_thunk.cc
@@ -15,7 +15,7 @@ namespace thunk {
 namespace {
 
 PP_Bool IsFullscreen(PP_Instance instance) {
-  EnterFunction<PPB_Instance_FunctionAPI> enter(instance, true);
+  EnterInstance enter(instance);
   if (enter.failed())
     return PP_FALSE;
   const ViewData* view = enter.functions()->GetViewData(instance);
@@ -25,14 +25,14 @@ PP_Bool IsFullscreen(PP_Instance instance) {
 }
 
 PP_Bool SetFullscreen(PP_Instance instance, PP_Bool fullscreen) {
-  EnterFunction<PPB_Instance_FunctionAPI> enter(instance, true);
+  EnterInstance enter(instance);
   if (enter.failed())
     return PP_FALSE;
   return enter.functions()->SetFullscreen(instance, fullscreen);
 }
 
 PP_Bool GetScreenSize(PP_Instance instance, PP_Size* size) {
-  EnterFunction<PPB_Instance_FunctionAPI> enter(instance, true);
+  EnterInstance enter(instance);
   if (enter.failed())
     return PP_FALSE;
   return enter.functions()->GetScreenSize(instance, size);