Update from https://crrev.com/320343

base/memory/discardable_memory_ashmem.h

Index: base/memory/discardable_memory_ashmem.h
diff --git a/base/memory/discardable_memory_ashmem.h b/base/memory/discardable_memory_ashmem.h
deleted file mode 100644
index 1269cc291d8b602d9081c66b6c5d3f1d685403ec..0000000000000000000000000000000000000000
--- a/base/memory/discardable_memory_ashmem.h
+++ /dev/null
@@ -1,55 +0,0 @@
-// Copyright 2014 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.
-
-#ifndef BASE_MEMORY_DISCARDABLE_MEMORY_ASHMEM_H_
-#define BASE_MEMORY_DISCARDABLE_MEMORY_ASHMEM_H_
-
-#include "base/memory/discardable_memory.h"
-
-#include "base/macros.h"
-#include "base/memory/discardable_memory_manager.h"
-
-namespace base {
-namespace internal {
-
-class DiscardableAshmemChunk;
-class DiscardableMemoryAshmemAllocator;
-class DiscardableMemoryManager;
-
-class DiscardableMemoryAshmem
-    : public DiscardableMemory,
-      public internal::DiscardableMemoryManagerAllocation {
- public:
-  explicit DiscardableMemoryAshmem(size_t bytes,
-                                   DiscardableMemoryAshmemAllocator* allocator,
-                                   DiscardableMemoryManager* manager);
-
-  ~DiscardableMemoryAshmem() override;
-
-  bool Initialize();
-
-  // Overridden from DiscardableMemory:
-  DiscardableMemoryLockStatus Lock() override;
-  void Unlock() override;
-  void* Memory() const override;
-
-  // Overridden from internal::DiscardableMemoryManagerAllocation:
-  bool AllocateAndAcquireLock() override;
-  void ReleaseLock() override;
-  void Purge() override;
-
- private:
-  const size_t bytes_;
-  DiscardableMemoryAshmemAllocator* const allocator_;
-  DiscardableMemoryManager* const manager_;
-  bool is_locked_;
-  scoped_ptr<DiscardableAshmemChunk> ashmem_chunk_;
-
-  DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryAshmem);
-};
-
-}  // namespace internal
-}  // namespace base
-
-#endif  // BASE_MEMORY_DISCARDABLE_MEMORY_ASHMEM_H_