Fix an ASAN compile error in AllocatorInterceptionMac.

base/allocator/allocator_interception_mac.mm

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file contains all the logic necessary to intercept allocations on
 // macOS. "malloc zones" are an abstraction that allows the process to intercept
 // all malloc-related functions.  There is no good mechanism [short of
 // interposition] to determine new malloc zones are added, so there's no clean
 // mechanism to intercept all malloc zones. This file contains logic to
 // intercept the default and purgeable zones, which always exist. A cursory
@@ skipping 352 matching lines @@
 
 void StoreFunctionsForDefaultZone(MallocZoneFunctions* functions) {
   ChromeMallocZone* default_zone = reinterpret_cast<ChromeMallocZone*>(
       malloc_default_zone());
   StoreZoneFunctions(default_zone, 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);
 }
 
 void InterceptAllocationsMac() {
   if (g_oom_killer_enabled)
     return;
 
   g_oom_killer_enabled = true;
@@ skipping 116 matching lines @@
   g_old_allocWithZone =
       reinterpret_cast<allocWithZone_t>(method_getImplementation(orig_method));
   CHECK(g_old_allocWithZone)
       << "Failed to get allocWithZone allocation function.";
   method_setImplementation(orig_method,
                            reinterpret_cast<IMP>(oom_killer_allocWithZone));
 }
 
 }  // namespace allocator
 }  // namespace base