Reland r24563 and r24564 with fixes cumbersome API leading to leaks.

runtime/vm/gc_marker.h

 // Copyright (c) 2011, 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.
 
 #ifndef VM_GC_MARKER_H_
 #define VM_GC_MARKER_H_
 
 #include "vm/allocation.h"
 
 namespace dart {
@@ skipping 23 matching lines @@
   void Epilogue(Isolate* isolate, bool invoke_api_callbacks);
   void IterateRoots(Isolate* isolate,
                     ObjectPointerVisitor* visitor,
                     bool visit_prologue_weak_persistent_handles);
   void IterateWeakRoots(Isolate* isolate,
                         HandleVisitor* visitor,
                         bool visit_prologue_weak_persistent_handles);
   void IterateWeakReferences(Isolate* isolate, MarkingVisitor* visitor);
   void DrainMarkingStack(Isolate* isolate, MarkingVisitor* visitor);
   void ProcessWeakProperty(RawWeakProperty* raw_weak, MarkingVisitor* visitor);
-  void ProcessPeerReferents(PageSpace* page_space);
+  void ProcessWeakTables(PageSpace* page_space);
 
   Heap* heap_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(GCMarker);
 };
 
 }  // namespace dart
 
 #endif  // VM_GC_MARKER_H_