Remove the partially completed code for remote IsolateMirrors and

runtime/vm/port.cc

Index: runtime/vm/port.cc
===================================================================
--- runtime/vm/port.cc	(revision 8116)
+++ runtime/vm/port.cc	(working copy)
@@ -217,6 +217,19 @@
 }
 
 
+bool PortMap::IsLocalPort(Dart_Port id) {
+  MutexLocker ml(mutex_);
+  intptr_t index = FindPort(id);
+  if (index < 0) {
+    // Port does not exist.
+    return false;
+  }
+
+  MessageHandler* handler = map_[index].handler;
+  return handler->IsCurrentIsolate();
+}
+
+
 void PortMap::InitOnce() {
   mutex_ = new Mutex();