Split an allocation policy into an allocator and a deallocator.

src/zone-inl.h

Index: src/zone-inl.h
diff --git a/src/zone-inl.h b/src/zone-inl.h
index ee96ec052eb9863201fabbbed2f211b33d8e9c8e..36ce001f94dcc564a54f13150f7786b765956748 100644
--- a/src/zone-inl.h
+++ b/src/zone-inl.h
@@ -90,7 +90,7 @@ ZoneSplayTree<Config>::~ZoneSplayTree() {
   // Reset the root to avoid unneeded iteration over all tree nodes
   // in the destructor.  For a zone-allocated tree, nodes will be
   // freed by the Zone.
-  SplayTree<Config, ZoneListAllocationPolicy>::ResetRoot();
+  SplayTree<Config, ZoneAllocationPolicy>::ResetRoot();
 }
 
 
@@ -106,7 +106,7 @@ void* ZoneObject::operator new(size_t size, Zone* zone) {
 }
 
 
-inline void* ZoneListAllocationPolicy::New(int size) {
+inline void* ZoneAllocator::New(int size) {
   return ZONE->New(size);
 }