Getting rid of Isolate::current_zone() usage. Pass thread instead of isolate where it makes sense.

runtime/lib/vmservice.cc

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 #include "vm/bootstrap_natives.h"
 
 #include "vm/dart_api_impl.h"
 #include "vm/exceptions.h"
 #include "vm/message.h"
 #include "vm/native_entry.h"
@@ skipping 45 matching lines @@
     const Integer& port_int = Integer::Handle(Integer::New(port_id));
     ASSERT(!port_int.IsNull());
     const SendPort& send_port = SendPort::Handle(SendPort::New(port_id));
     const String& name = String::Handle(String::New(isolate->name()));
     ASSERT(!name.IsNull());
     const Array& args = Array::Handle(Array::New(3));
     ASSERT(!args.IsNull());
     args.SetAt(0, port_int);
     args.SetAt(1, send_port);
     args.SetAt(2, name);
-    Object& r = Object::Handle(service_isolate_->current_zone());
-    r = DartEntry::InvokeFunction(register_function_, args);
+    const Object& r = Object::Handle(
+        DartEntry::InvokeFunction(register_function_, args));
     if (FLAG_trace_service) {
       OS::Print("vm-service: Isolate %s %" Pd64 " registered.\n",
                 name.ToCString(),
                 port_id);
     }
     ASSERT(!r.IsError());
   }
 
  private:
   Function& register_function_;
@@ skipping 67 matching lines @@
   Service::CancelStream(stream_id.ToCString());
   return Object::null();
 }
 
 
 DEFINE_NATIVE_ENTRY(VMService_RequestAssets, 0) {
   return Service::RequestAssets();
 }
 
 }  // namespace dart