Fix an ASAN compile error in AllocatorInterceptionMac.

base/allocator/allocator_interception_mac.mm

Index: base/allocator/allocator_interception_mac.mm
diff --git a/base/allocator/allocator_interception_mac.mm b/base/allocator/allocator_interception_mac.mm
index 431c2c79ce4ab876e556098a7cf7c52aeb4acc6d..be6c0fa4e9e7261012d2af6525d31fbee9986343 100644
--- a/base/allocator/allocator_interception_mac.mm
+++ b/base/allocator/allocator_interception_mac.mm
@@ -370,7 +370,9 @@ void StoreFunctionsForDefaultZone(MallocZoneFunctions* functions) {
 void ReplaceFunctionsForDefaultZone(const MallocZoneFunctions* functions) {
   CHECK(!g_replaced_default_zone);
   g_replaced_default_zone = true;
+#if !defined(ADDRESS_SANITIZER)
   StoreFunctionsForDefaultZone(&g_old_zone);
+#endif
   ChromeMallocZone* default_zone = reinterpret_cast<ChromeMallocZone*>(
       malloc_default_zone());
   ReplaceZoneFunctions(default_zone, functions);