Fixed zapping of contents

src/zone/accounting-allocator.cc

Index: src/zone/accounting-allocator.cc
diff --git a/src/zone/accounting-allocator.cc b/src/zone/accounting-allocator.cc
index 623cb5718af5148cda57bfd015959bee1b7ff357..663ea321a4494e65d2b1205cd8e20ea60ab863ca 100644
--- a/src/zone/accounting-allocator.cc
+++ b/src/zone/accounting-allocator.cc
@@ -29,6 +29,7 @@ Segment* AccountingAllocator::AllocateSegment(size_t bytes) {
 void AccountingAllocator::FreeSegment(Segment* memory) {
   base::NoBarrier_AtomicIncrement(
       &current_memory_usage_, -static_cast<base::AtomicWord>(memory->size()));
+  memory->ZapHeader();
   free(memory);
 }