Implicit references are missing in heap profiles

src/api.cc

Index: src/api.cc
===================================================================
--- src/api.cc	(revision 13465)
+++ src/api.cc	(working copy)
@@ -5483,20 +5483,6 @@
 }
 
 
-void V8::SetGlobalGCPrologueCallback(GCCallback callback) {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::V8::SetGlobalGCPrologueCallback()")) return;
-  isolate->heap()->SetGlobalGCPrologueCallback(callback);
-}
-
-
-void V8::SetGlobalGCEpilogueCallback(GCCallback callback) {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (IsDeadCheck(isolate, "v8::V8::SetGlobalGCEpilogueCallback()")) return;
-  isolate->heap()->SetGlobalGCEpilogueCallback(callback);
-}
-
-
 void V8::AddGCPrologueCallback(GCPrologueCallback callback, GCType gc_type) {
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::V8::AddGCPrologueCallback()")) return;