Move ashmem utility functions to discardable_memory_allocator_android.cc.

base/memory/discardable_memory_android.h

-// Copyright 2013 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.
-
-// Please use discardable_memory.h since this is just an internal file providing
-// utility functions used both by discardable_memory_android.cc and
-// discardable_memory_allocator_android.cc.
-
-#ifndef BASE_MEMORY_DISCARDABLE_MEMORY_ANDROID_H_
-#define BASE_MEMORY_DISCARDABLE_MEMORY_ANDROID_H_
-
-#include "base/basictypes.h"
-#include "base/memory/discardable_memory.h"
-
-namespace base {
-namespace internal {
-
-bool CreateAshmemRegion(const char* name, size_t size, int* fd, void** address);
-
-bool CloseAshmemRegion(int fd, size_t size, void* address);
-
-DiscardableMemoryLockStatus LockAshmemRegion(int fd,
-                                             size_t offset,
-                                             size_t size,
-                                             const void* address);
-
-bool UnlockAshmemRegion(int fd,
-                        size_t offset,
-                        size_t size,
-                        const void* address);
-
-}  // namespace internal
-}  // namespace base
-
-#endif  // BASE_MEMORY_DISCARDABLE_MEMORY_ANDROID_H_