Get rid of ZoneScope completely.

src/zone-inl.h

Index: src/zone-inl.h
diff --git a/src/zone-inl.h b/src/zone-inl.h
index b2adc1796c4a87569f79a562836354c0e6984af9..b498ea776b75f2a77b61cb39ecefb77f418a1e80 100644
--- a/src/zone-inl.h
+++ b/src/zone-inl.h
@@ -40,7 +40,6 @@ namespace internal {
 
 
 inline void* Zone::New(int size) {
-  ASSERT(scope_nesting_ > 0);
   // Round up the requested size to fit the alignment.
   size = RoundUp(size, kAlignment);
 
@@ -110,17 +109,6 @@ void* ZoneList<T>::operator new(size_t size, Zone* zone) {
 }
 
 
-ZoneScope::ZoneScope(Zone* zone)
-    : zone_(zone) {
-  zone_->scope_nesting_++;
-}
-
-
-bool ZoneScope::ShouldDeleteOnExit() {
-  return zone_->scope_nesting_ == 1;
-}
-
-
 } }  // namespace v8::internal
 
 #endif  // V8_ZONE_INL_H_