Use gender neutral terms in heap.cc

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 5605291a7dff5bf55c833a9491955c31313e2f56..2ac18710822745bdbef2ec37c162e7ec4aeadbf0 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1628,7 +1628,7 @@ void Heap::Scavenge() {
   scavenge_collector_->SelectScavengingVisitorsTable();
 
   if (UsingEmbedderHeapTracer()) {
-    // Register found wrappers with embedder so he can add them to his marking
+    // Register found wrappers with embedder so it can add them to its marking
     // deque and correctly manage the case when v8 scavenger collects the
     // wrappers by either keeping wrappables alive, or cleaning marking deque.
     mark_compact_collector()->RegisterWrappersWithEmbedderHeapTracer();