Revert of mac: Periodically shim new malloc zones immediately after startup.

base/allocator/allocator_interception_mac_unittest.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.
-
-#include <mach/mach.h>
-
-#include "base/allocator/allocator_interception_mac.h"
-#include "base/allocator/allocator_shim.h"
-#include "base/allocator/malloc_zone_functions_mac.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace base {
-namespace allocator {
-
-namespace {
-void ResetMallocZone(ChromeMallocZone* zone) {
-  MallocZoneFunctions& functions = GetFunctionsForZone(zone);
-  ReplaceZoneFunctions(zone, &functions);
-}
-
-void ResetAllMallocZones() {
-  ChromeMallocZone* default_malloc_zone =
-      reinterpret_cast<ChromeMallocZone*>(malloc_default_zone());
-  ResetMallocZone(default_malloc_zone);
-
-  vm_address_t* zones;
-  unsigned int count;
-  kern_return_t kr = malloc_get_all_zones(mach_task_self(), 0, &zones, &count);
-  if (kr != KERN_SUCCESS)
-    return;
-  for (unsigned int i = 0; i < count; ++i) {
-    ChromeMallocZone* zone = reinterpret_cast<ChromeMallocZone*>(zones[i]);
-    ResetMallocZone(zone);
-  }
-}
-}  // namespace
-
-class AllocatorInterceptionTest : public testing::Test {
- protected:
-  void TearDown() override {
-    ResetAllMallocZones();
-    ClearAllMallocZonesForTesting();
-  }
-};
-
-TEST_F(AllocatorInterceptionTest, ShimNewMallocZones) {
-  InitializeAllocatorShim();
-  ChromeMallocZone* default_malloc_zone =
-      reinterpret_cast<ChromeMallocZone*>(malloc_default_zone());
-
-  malloc_zone_t new_zone;
-  memset(&new_zone, 1, sizeof(malloc_zone_t));
-  malloc_zone_register(&new_zone);
-  EXPECT_NE(new_zone.malloc, default_malloc_zone->malloc);
-  ShimNewMallocZones();
-  EXPECT_EQ(new_zone.malloc, default_malloc_zone->malloc);
-
-  malloc_zone_unregister(&new_zone);
-}
-
-}  // namespace allocator
-}  // namespace base