Avoid some crashes when running without snapshots.

src/liveedit.cc

Index: src/liveedit.cc
diff --git a/src/liveedit.cc b/src/liveedit.cc
index e7d47e5e25aa33fd0258b201129fac98ebf86b85..1e2e2672a1e2e52bc6229cdfc5fd283327ab73a8 100644
--- a/src/liveedit.cc
+++ b/src/liveedit.cc
@@ -1022,7 +1022,7 @@ static void ReplaceCodeObject(Code* original, Code* substitution) {
 
   // Now iterate over all pointers of all objects, including code_target
   // implicit pointers.
-  for (HeapObject* obj = iterator.Next(); obj != NULL; obj = iterator.Next()) {
+  for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
     obj->Iterate(&visitor);
   }