Remove spawnDomFunction from dart:html

tools/dom/src/native_DOMImplementation.dart

Index: tools/dom/src/native_DOMImplementation.dart
diff --git a/tools/dom/src/native_DOMImplementation.dart b/tools/dom/src/native_DOMImplementation.dart
index 2a063c0f491e188066d7cad1a7b6f1d6f5388473..a7ec6464319816676a7bbf9c527eb05601af2f8b 100644
--- a/tools/dom/src/native_DOMImplementation.dart
+++ b/tools/dom/src/native_DOMImplementation.dart
@@ -94,7 +94,6 @@ class _Utils {
   static window() native "Utils_window";
   static forwardingPrint(String message) native "Utils_forwardingPrint";
   static void spawnDomFunction(Function f, int replyTo) native "Utils_spawnDomFunction";
-  static void spawnDomUri(String uri, int replyTo) native "Utils_spawnDomUri";
   static int _getNewIsolateId() native "Utils_getNewIsolateId";
 
   // The following methods were added for debugger integration to make working
@@ -366,8 +365,28 @@ class _DOMStringMap extends NativeFieldWrapperClass1 implements Map<String, Stri
   bool get isNotEmpty => Maps.isNotEmpty(this);
 }
 
+// TODO(vsm): Remove DOM isolate code.  This is only used to support
+// printing and timers in background isolates.  Background isolates
+// should just forward to the main DOM isolate instead of requiring a
+// special DOM isolate.
+
+_makeSendPortFuture(spawnRequest) {
+  final completer = new Completer<SendPort>.sync();
+  final port = new ReceivePort();
+  port.receive((result, _) {
+    completer.complete(result);
+    port.close();
+  });
+  // TODO: SendPort.hashCode is ugly way to access port id.
+  spawnRequest(port.toSendPort().hashCode);
+  return completer.future;
+}
+
+Future<SendPort> _spawnDomFunction(Function f) =>
+    _makeSendPortFuture((portId) { _Utils.spawnDomFunction(f, portId); });
+
 final Future<SendPort> __HELPER_ISOLATE_PORT =
-    spawnDomFunction(_helperIsolateMain);
+    _spawnDomFunction(_helperIsolateMain);
 
 // Tricky part.
 // Once __HELPER_ISOLATE_PORT gets resolved, it will still delay in .then