Simplify the builtin functions and get rid of unused code.

bin/builtin_natives.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/builtin.h"
 
 #include <stdlib.h>
 #include <string.h>
 
 #include "bin/dartutils.h"
@@ skipping 106 matching lines @@
   fflush(out);
 }
 
 
 void FUNCTION_NAME(Logger_PrintString)(Dart_NativeArguments args) {
   Dart_EnterScope();
   Builtin::PrintString(stdout, Dart_GetNativeArgument(args, 0));
   Dart_ExitScope();
 }
 
+
 void FUNCTION_NAME(Exit)(Dart_NativeArguments args) {
   Dart_EnterScope();
   int64_t status = 0;
   // Ignore result if passing invalid argument and just exit 0.
   DartUtils::GetInt64Value(Dart_GetNativeArgument(args, 0), &status);
   Dart_ExitScope();
   exit(status);
 }
-
-
-void Builtin::SetupIOLibrary(Dart_Handle io_lib) {
-  Dart_Handle url = Dart_NewString(DartUtils::kIsolateLibURL);
-  DART_CHECK_VALID(url);
-  Dart_Handle isolate_lib = Dart_LookupLibrary(url);
-  DART_CHECK_VALID(isolate_lib);
-  Dart_Handle timer_closure =
-      Dart_Invoke(io_lib, Dart_NewString("_getTimerFactoryClosure"), 0, NULL);
-  Dart_Handle args[1];
-  args[0] = timer_closure;
-  DART_CHECK_VALID(Dart_Invoke(isolate_lib,
-                               Dart_NewString("_setTimerFactoryClosure"),
-                               1, args));
-}