Revert r13188, r13194, r13256 (Deferred formatting of error stack trace during GC).

src/heap-inl.h

Index: src/heap-inl.h
diff --git a/src/heap-inl.h b/src/heap-inl.h
index 6d2e9582e46caed128ae2df28b6e7f578c52ad8a..deb767e109d3dbb4eea7a61f1505569f0d641a04 100644
--- a/src/heap-inl.h
+++ b/src/heap-inl.h
@@ -666,19 +666,6 @@ void ExternalStringTable::ShrinkNewStrings(int position) {
 }
 
 
-void ErrorObjectList::Add(JSObject* object) {
-  list_.Add(object);
-}
-
-
-void ErrorObjectList::Iterate(ObjectVisitor* v) {
-  if (!list_.is_empty()) {
-    Object** start = &list_[0];
-    v->VisitPointers(start, start + list_.length());
-  }
-}
-
-
 void Heap::ClearInstanceofCache() {
   set_instanceof_cache_function(the_hole_value());
 }