Revert r43217, r43215, r43208, r43207, and r43202.

runtime/bin/dartutils.h

Index: runtime/bin/dartutils.h
diff --git a/runtime/bin/dartutils.h b/runtime/bin/dartutils.h
index e7fcd47acfe201eb6dd8425cea275fe3c3149f61..9b6557cbb2d214f9df52af3ace9e5d61c216642b 100644
--- a/runtime/bin/dartutils.h
+++ b/runtime/bin/dartutils.h
@@ -124,14 +124,8 @@ class DartUtils {
                                        Dart_Handle url);
   static Dart_Handle LoadScript(const char* script_uri,
                                 Dart_Handle builtin_lib);
-  static void PrepareBuiltinLibrary(Dart_Handle builtin_lib,
-                                    const char* package_root);
-  static void PrepareCoreLibrary(Dart_Handle builtin_lib);
-  static void PrepareAsyncLibrary(Dart_Handle async_lib,
-                                  Dart_Handle io_lib);
   static Dart_Handle PrepareForScriptLoading(const char* package_root,
                                              Dart_Handle builtin_lib);
-  static void SetupIOLibrary(const char* script_uri);
 
   static bool PostNull(Dart_Port port_id);
   static bool PostInt32(Dart_Port port_id, int32_t value);
@@ -151,7 +145,6 @@ class DartUtils {
                                                  const char* exception_name,
                                                  const char* message);
   static Dart_Handle NewDartArgumentError(const char* message);
-  static Dart_Handle NewDartUnsupportedError(const char* message);
   static Dart_Handle NewDartIOException(const char* exception_name,
                                         const char* message,
                                         Dart_Handle os_error);