[counting_allocator] Chrome changes.

base/containers/hash_tables.h

Index: base/containers/hash_tables.h
diff --git a/base/containers/hash_tables.h b/base/containers/hash_tables.h
index 8da7b6726852d2c762c6c2ff9ad5035d7450e5ba..428334fc8a0b0ca87d5c89052d1e39132944ea11 100644
--- a/base/containers/hash_tables.h
+++ b/base/containers/hash_tables.h
@@ -40,12 +40,19 @@ struct hash<std::pair<Type1, Type2>> {
 
 namespace base {
 
+#if defined(_LIBCPP_COUNTING_ALLOCATOR)
+#define HASH_CONTAINER_ALLOCATOR(group, type...) \
+    std::counting_allocator<type, std::allocation_group::group>
+#else
+#define HASH_CONTAINER_ALLOCATOR(group, type...) std::allocator<type>
+#endif
+
 // Use std::unordered_map instead.
 template <class Key,
           class T,
           class Hash = BASE_HASH_NAMESPACE::hash<Key>,
           class Pred = std::equal_to<Key>,
-          class Alloc = std::allocator<std::pair<const Key, T>>>
+          class Alloc = HASH_CONTAINER_ALLOCATOR(unordered_map, std::pair<const Key, T>)>
 using hash_map = std::unordered_map<Key, T, Hash, Pred, Alloc>;
 
 // Use std::unordered_multimap instead.
@@ -53,23 +60,25 @@ template <class Key,
           class T,
           class Hash = BASE_HASH_NAMESPACE::hash<Key>,
           class Pred = std::equal_to<Key>,
-          class Alloc = std::allocator<std::pair<const Key, T>>>
+          class Alloc = HASH_CONTAINER_ALLOCATOR(unordered_multimap, std::pair<const Key, T>)>
 using hash_multimap = std::unordered_multimap<Key, T, Hash, Pred, Alloc>;
 
 // Use std::unordered_multiset instead.
 template <class Key,
           class Hash = BASE_HASH_NAMESPACE::hash<Key>,
           class Pred = std::equal_to<Key>,
-          class Alloc = std::allocator<Key>>
+          class Alloc = HASH_CONTAINER_ALLOCATOR(unordered_multiset, Key)>
 using hash_multiset = std::unordered_multiset<Key, Hash, Pred, Alloc>;
 
 // Use std::unordered_set instead.
 template <class Key,
           class Hash = BASE_HASH_NAMESPACE::hash<Key>,
           class Pred = std::equal_to<Key>,
-          class Alloc = std::allocator<Key>>
+          class Alloc = HASH_CONTAINER_ALLOCATOR(unordered_set, Key)>
 using hash_set = std::unordered_set<Key, Hash, Pred, Alloc>;
 
+#undef HASH_CONTAINER_ALLOCATOR
+
 }  // namespace base
 
 #endif  // BASE_CONTAINERS_HASH_TABLES_H_