Refactor PPB_Flash_Fullscreen to the new resource model.

ppapi/thunk/ppb_flash_fullscreen_thunk.cc

Index: ppapi/thunk/ppb_flash_fullscreen_thunk.cc
diff --git a/ppapi/thunk/ppb_flash_fullscreen_thunk.cc b/ppapi/thunk/ppb_flash_fullscreen_thunk.cc
index 598dc715da59739b3d5a90be85f4bf5d9533068a..f64ad992fda4644a70dbb337bc66a0ec0215d039 100644
--- a/ppapi/thunk/ppb_flash_fullscreen_thunk.cc
+++ b/ppapi/thunk/ppb_flash_fullscreen_thunk.cc
@@ -6,8 +6,8 @@
 #include "ppapi/c/private/ppb_flash_fullscreen.h"
 #include "ppapi/thunk/thunk.h"
 #include "ppapi/thunk/enter.h"
+#include "ppapi/thunk/ppb_flash_fullscreen_api.h"
 #include "ppapi/thunk/ppb_instance_api.h"
-#include "ppapi/thunk/ppb_flash_api.h"
 #include "ppapi/thunk/resource_creation_api.h"
 
 namespace ppapi {
@@ -16,25 +16,26 @@ namespace thunk {
 namespace {
 
 PP_Bool IsFullscreen(PP_Instance instance) {
-  EnterInstance enter(instance);
+  EnterInstanceAPI<PPB_Flash_Fullscreen_API> enter(instance);
   if (enter.failed())
     return PP_FALSE;
-  return enter.functions()->GetFlashAPI()->FlashIsFullscreen(instance);
+  return enter.functions()->IsFullscreen(instance);
 }
 
 PP_Bool SetFullscreen(PP_Instance instance, PP_Bool fullscreen) {
-  EnterInstance enter(instance);
+  EnterInstanceAPI<PPB_Flash_Fullscreen_API> enter(instance);
   if (enter.failed())
     return PP_FALSE;
-  return enter.functions()->GetFlashAPI()->FlashSetFullscreen(instance,
-                                                              fullscreen);
+  return enter.functions()->SetFullscreen(instance, fullscreen);
 }
 
+// TODO(raymes): The codepaths for GetScreenSize in PPB_Fullscreen and
+// PPB_Flash_Fullscreen are the same. Consider deprecating the flash version.
 PP_Bool GetScreenSize(PP_Instance instance, PP_Size* size) {
   EnterInstance enter(instance);
   if (enter.failed())
     return PP_FALSE;
-  return enter.functions()->GetFlashAPI()->FlashGetScreenSize(instance, size);
+  return enter.functions()->GetScreenSize(instance, size);
 }
 
 const PPB_FlashFullscreen_0_1 g_ppb_flash_fullscreen_thunk = {