Remove hack http client and use the one in dart:io

runtime/bin/dartutils.h

Index: runtime/bin/dartutils.h
diff --git a/runtime/bin/dartutils.h b/runtime/bin/dartutils.h
index e8b990873098d7d0dc5c4ff9a037d45bc8fba846..b84e773fdb8966f0e3eaa0e7aa3eb091cfdc2589 100644
--- a/runtime/bin/dartutils.h
+++ b/runtime/bin/dartutils.h
@@ -121,7 +121,7 @@ class DartUtils {
                                        Dart_Handle url);
   static Dart_Handle LoadScript(const char* script_uri,
                                 Dart_Handle builtin_lib);
-  static Dart_Handle LoadScriptHttp(const char* script_uri,
+  static Dart_Handle LoadScriptHttp(Dart_Handle script_uri,
                                     Dart_Handle builtin_lib);
   static Dart_Handle LoadSource(CommandLineOptions* url_mapping,
                                 Dart_Handle library,
@@ -168,15 +168,6 @@ class DartUtils {
   static Dart_Handle FilePathFromUri(Dart_Handle script_uri,
                                      Dart_Handle builtin_lib);
 
-  static Dart_Handle PathFromUri(Dart_Handle script_uri,
-                                 Dart_Handle builtin_lib);
-
-  static Dart_Handle DomainFromUri(Dart_Handle script_uri,
-                                   Dart_Handle builtin_lib);
-
-  static Dart_Handle PortFromUri(Dart_Handle script_uri,
-                                 Dart_Handle builtin_lib);
-
   static Dart_Handle ResolveUri(Dart_Handle library_url,
                                 Dart_Handle url,
                                 Dart_Handle builtin_lib);