External references should not affect dominance relation.

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5980 matching lines @@
           edge->index())));
     default: UNREACHABLE();
   }
   return v8::Undefined();
 }
 
 
 const HeapGraphNode* HeapGraphEdge::GetFromNode() const {
   i::Isolate* isolate = i::Isolate::Current();
   IsDeadCheck(isolate, "v8::HeapGraphEdge::GetFromNode");
-  const i::HeapEntry* from = ToInternal(this)->From();
+  const i::HeapEntry* from = ToInternal(this)->from();
   return reinterpret_cast<const HeapGraphNode*>(from);
 }
 
 
 const HeapGraphNode* HeapGraphEdge::GetToNode() const {
   i::Isolate* isolate = i::Isolate::Current();
   IsDeadCheck(isolate, "v8::HeapGraphEdge::GetToNode");
   const i::HeapEntry* to = ToInternal(this)->to();
   return reinterpret_cast<const HeapGraphNode*>(to);
 }
@@ skipping 388 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* scope_implementer =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   scope_implementer->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal