Remove support for object grouping during Garbage Collection

runtime/vm/object.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 "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 19361 matching lines @@
   Utf8::Encode(*this, reinterpret_cast<char*>(utf8_array), array_len);
 }
 
 
 static FinalizablePersistentHandle* AddFinalizer(
     const Object& referent,
     void* peer,
     Dart_WeakPersistentHandleFinalizer callback) {
   ASSERT((callback != NULL && peer != NULL) ||
          (callback == NULL && peer == NULL));
-  const bool is_prologue = false;
   // TODO(19482): Make API consistent for external size of strings/typed data.
   const intptr_t external_size = 0;
   return FinalizablePersistentHandle::New(Isolate::Current(),
-                                          is_prologue,
                                           referent,
                                           peer,
                                           callback,
                                           external_size);
 }
 
 
 RawString* String::MakeExternal(void* array,
                                 intptr_t length,
                                 void* peer,
@@ skipping 2535 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart