Revert "Unify dart:isolate."

runtime/lib/isolate.dart

Index: runtime/lib/isolate.dart
diff --git a/runtime/lib/isolate_patch.dart b/runtime/lib/isolate.dart
similarity index 93%
rename from runtime/lib/isolate_patch.dart
rename to runtime/lib/isolate.dart
index 10f2c85f02231c92475f9546dd19dd35ddf92f5d..41c039cbe69b7caa79178f028a8266865dcdec13 100644
--- a/runtime/lib/isolate_patch.dart
+++ b/runtime/lib/isolate.dart
@@ -2,13 +2,15 @@
 // 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.
 
-patch class _ReceivePortFactory {
-  /* patch */ factory ReceivePort() {
+class _ReceivePortFactory {
+  factory ReceivePort() {
     return new _ReceivePortImpl();
   }
 }
 
+
 class _ReceivePortImpl implements ReceivePort {
+  /*--- public interface ---*/
   factory _ReceivePortImpl() native "ReceivePortImpl_factory";
 
   receive(void onMessage(var message, SendPort replyTo)) {
@@ -116,14 +118,13 @@ _getPortInternal() native "isolate_getPortInternal";
 
 ReceivePort _portInternal;
 
-patch ReceivePort get port() {
+ReceivePort get _port() {
   if (_portInternal === null) {
     _portInternal = _getPortInternal();
   }
   return _portInternal;
 }
 
-patch spawnFunction(void topLevelFunction()) native "isolate_spawnFunction";
-
-patch spawnUri(String uri) native "isolate_spawnUri";
+_spawnFunction(void topLevelFunction()) native "isolate_spawnFunction";
 
+_spawnUri(String uri) native "isolate_spawnUri";