Refactor resolution code in the vm to properly handle ambiguity errors.

runtime/lib/isolate.cc

 // Copyright (c) 2012, 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 "platform/assert.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
@@ skipping 43 matching lines @@
     ASSERT(!isolate_lib.IsNull());
     const String& class_name =
         String::Handle(isolate_lib.PrivateName(Symbols::_ReceivePortImpl()));
     const String& function_name =
         String::Handle(isolate_lib.PrivateName(Symbols::_get_or_create()));
     func = Resolver::ResolveStatic(isolate_lib,
                                    class_name,
                                    function_name,
                                    kNumArguments,
                                    Object::empty_array(),
-                                   Resolver::kIsQualified);
+                                   Resolver::kIsQualified,
+                                   NULL);  // No ambiguity error expected.
     ASSERT(!func.IsNull());
     isolate->object_store()->set_receive_port_create_function(func);
   }
   const Array& args = Array::Handle(isolate, Array::New(kNumArguments));
   args.SetAt(0, Integer::Handle(isolate, Integer::New(port_id)));
   const Object& result =
       Object::Handle(isolate, DartEntry::InvokeFunction(func, args));
   if (!result.IsError()) {
     PortMap::SetLive(port_id);
   }
@@ skipping 220 matching lines @@
 
 DEFINE_NATIVE_ENTRY(isolate_getPortInternal, 0) {
   const Object& port = Object::Handle(ReceivePortCreate(isolate->main_port()));
   if (port.IsError()) {
     Exceptions::PropagateError(Error::Cast(port));
   }
   return port.raw();
 }
 
 }  // namespace dart