Merge ObjectIterator::has_next and ObjectIterator::next methods....

src/debug.cc

Index: src/debug.cc
===================================================================
--- src/debug.cc	(revision 3683)
+++ src/debug.cc	(working copy)
@@ -1695,9 +1695,7 @@
   // Scan heap for Script objects.
   int count = 0;
   HeapIterator iterator;
-  while (iterator.has_next()) {
-    HeapObject* obj = iterator.next();
-    ASSERT(obj != NULL);
+  for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
     if (obj->IsScript() && Script::cast(obj)->HasValidSource()) {
       script_cache_->Add(Handle<Script>(Script::cast(obj)));
       count++;