Use macros to define pepper interfaces

ppapi/proxy/ppb_file_system_proxy.cc

Index: ppapi/proxy/ppb_file_system_proxy.cc
diff --git a/ppapi/proxy/ppb_file_system_proxy.cc b/ppapi/proxy/ppb_file_system_proxy.cc
index 899c51f82821641f8c394acc71a4886217af2f3f..8fc7b552a4218ea73755562c75318b7d68e37102 100644
--- a/ppapi/proxy/ppb_file_system_proxy.cc
+++ b/ppapi/proxy/ppb_file_system_proxy.cc
@@ -27,9 +27,8 @@ namespace proxy {
 
 namespace {
 
-InterfaceProxy* CreateFileSystemProxy(Dispatcher* dispatcher,
-                                      const void* target_interface) {
-  return new PPB_FileSystem_Proxy(dispatcher, target_interface);
+InterfaceProxy* CreateFileSystemProxy(Dispatcher* dispatcher) {
+  return new PPB_FileSystem_Proxy(dispatcher);
 }
 
 }  // namespace
@@ -110,9 +109,8 @@ void FileSystem::OpenComplete(int32_t result) {
   PP_RunAndClearCompletionCallback(&current_open_callback_, result);
 }
 
-PPB_FileSystem_Proxy::PPB_FileSystem_Proxy(Dispatcher* dispatcher,
-                                           const void* target_interface)
-    : InterfaceProxy(dispatcher, target_interface),
+PPB_FileSystem_Proxy::PPB_FileSystem_Proxy(Dispatcher* dispatcher)
+    : InterfaceProxy(dispatcher),
       callback_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
 }
 
@@ -160,7 +158,7 @@ bool PPB_FileSystem_Proxy::OnMessageReceived(const IPC::Message& msg) {
 void PPB_FileSystem_Proxy::OnMsgCreate(PP_Instance instance,
                                        int type,
                                        HostResource* result) {
-  EnterFunctionNoLock<ResourceCreationAPI> enter(instance, true);
+  thunk::EnterResourceCreation enter(instance);
   if (enter.failed())
     return;
   PP_Resource resource = enter.functions()->CreateFileSystem(