Revert of [Tracing] Add allocation register for heap profiling

base/trace_event/memory_profiler_allocation_register_posix.cc

-// Copyright 2015 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 "base/trace_event/memory_profiler_allocation_register.h"
-
-#include <sys/mman.h>
-#include <unistd.h>
-
-#include "base/basictypes.h"
-#include "base/bits.h"
-#include "base/logging.h"
-#include "base/process/process_metrics.h"
-
-#ifndef MAP_ANONYMOUS
-#define MAP_ANONYMOUS MAP_ANON
-#endif
-
-namespace base {
-namespace trace_event {
-
-namespace {
-size_t GetGuardSize() {
-  return GetPageSize();
-}
-}
-
-// static
-void* AllocationRegister::AllocateVirtualMemory(size_t size) {
-  size = bits::Align(size, GetPageSize());
-
-  // Add space for a guard page at the end.
-  size_t map_size = size + GetGuardSize();
-
-  void* addr = mmap(nullptr, map_size, PROT_READ | PROT_WRITE,
-                    MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
-
-  PCHECK(addr != MAP_FAILED);
-
-  // Mark the last page of the allocated address space as inaccessible
-  // (PROT_NONE). The read/write accessible space is still at least |min_size|
-  // bytes.
-  void* guard_addr =
-      reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(addr) + size);
-  int result = mprotect(guard_addr, GetGuardSize(), PROT_NONE);
-  PCHECK(result == 0);
-
-  return addr;
-}
-
-// static
-void AllocationRegister::FreeVirtualMemory(void* address,
-                                           size_t allocated_size) {
-  size_t size = bits::Align(allocated_size, GetPageSize()) + GetGuardSize();
-  munmap(address, size);
-}
-
-}  // namespace trace_event
-}  // namespace base