Delete builtins that became unused after source loading was refactored.

runtime/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 <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 
 #include "include/dart_api.h"
 #include "include/dart_tools_api.h"
 
 #include "platform/assert.h"
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
 #include "bin/embedded_dart_io.h"
 #include "bin/file.h"
 #include "bin/io_natives.h"
 #include "bin/platform.h"
 
 namespace dart {
 namespace bin {
 
 // Lists the native functions implementing basic functionality in
 // standalone dart, such as printing, file I/O, and platform information.
 // Advanced I/O classes like sockets and process management are implemented
 // using functions listed in io_natives.cc.
 #define BUILTIN_NATIVE_LIST(V)                                                 \
   V(Builtin_PrintString, 1)                                                    \
-  V(Builtin_LoadSource, 4)                                                     \
-  V(Builtin_AsyncLoadError, 3)                                                 \
-  V(Builtin_DoneLoading, 0)                                                    \
   V(Builtin_GetCurrentDirectory, 0)                                            \
 
 
 BUILTIN_NATIVE_LIST(DECLARE_FUNCTION);
 
 static struct NativeEntries {
   const char* name_;
   Dart_NativeFunction function_;
   int argument_count_;
 } BuiltinEntries[] = {
@@ skipping 68 matching lines @@
     // For now we report print output on the Stdout stream.
     uint8_t newline[] = { '\n' };
     Dart_ServiceSendDataEvent("Stdout", "WriteEvent", chars, length);
     Dart_ServiceSendDataEvent("Stdout", "WriteEvent",
                               newline, sizeof(newline));
   }
 }
 
 }  // namespace bin
 }  // namespace dart