Revert "Introduce a handle zapping setting, and enable it by default for release and debug" due to …

src/global-handles.cc

Index: src/global-handles.cc
diff --git a/src/global-handles.cc b/src/global-handles.cc
index fa782245f2e4ded28f19ca0034a8ba16cfaaf608..5c65635d0f9f3c31f747656dee7ef4ac9bcbf20e 100644
--- a/src/global-handles.cc
+++ b/src/global-handles.cc
@@ -78,7 +78,7 @@ class GlobalHandles::Node {
                   Internals::kNodeIsPartiallyDependentShift);
   }
 
-#ifdef ENABLE_HANDLE_ZAPPING
+#ifdef ENABLE_EXTRA_CHECKS
   ~Node() {
     // TODO(1428): if it's a weak handle we should have invoked its callback.
     // Zap the values for eager trapping.
@@ -117,7 +117,7 @@ class GlobalHandles::Node {
   void Release() {
     ASSERT(state() != FREE);
     set_state(FREE);
-#ifdef ENABLE_HANDLE_ZAPPING
+#ifdef ENABLE_EXTRA_CHECKS
     // Zap the values for eager trapping.
     object_ = reinterpret_cast<Object*>(kGlobalHandleZapValue);
     class_id_ = v8::HeapProfiler::kPersistentHandleNoClassId;