Fixed test memory leaks

src/zone.h

Index: src/zone.h
diff --git a/src/zone.h b/src/zone.h
index 45c52a257136b3d5d5406343413ef7f9d8902d09..df691555204c894eabf858c8e2df06058213e333 100644
--- a/src/zone.h
+++ b/src/zone.h
@@ -58,6 +58,9 @@ class Zone {
   // allocating new segments of memory on demand using malloc().
   static inline void* New(int size);
 
+  template <typename T>
+  static inline T* NewArray(int length);
+
   // Delete all objects and free all memory allocated in the Zone.
   static void DeleteAll();