Remove partial blockfile v3 disk_cache implementation.

net/disk_cache/blockfile/block_bitmaps_v3.h

-// Copyright (c) 2012 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.
-
-// See net/disk_cache/disk_cache.h for the public interface.
-
-#ifndef NET_DISK_CACHE_BLOCKFILE_BLOCK_BITMAPS_V3_H_
-#define NET_DISK_CACHE_BLOCKFILE_BLOCK_BITMAPS_V3_H_
-
-#include "base/files/file_path.h"
-#include "base/macros.h"
-#include "net/base/net_export.h"
-#include "net/disk_cache/blockfile/addr.h"
-#include "net/disk_cache/blockfile/block_files.h"
-
-namespace disk_cache {
-
-class BackendImplV3;
-
-// This class is the interface in the v3 disk cache to the set of files holding
-// cached data that is small enough to not be efficiently stored in a dedicated
-// file (i.e. < kMaxBlockSize). It is primarily used to allocate and free
-// regions in those files used to store data.
-class NET_EXPORT_PRIVATE BlockBitmaps {
- public:
-  BlockBitmaps();
-  ~BlockBitmaps();
-
-  void Init(const BlockFilesBitmaps& bitmaps);
-
-  // Creates a new entry on a block file. block_type indicates the size of block
-  // to be used (as defined on cache_addr.h), block_count is the number of
-  // blocks to allocate, and block_address is the address of the new entry.
-  bool CreateBlock(FileType block_type, int block_count, Addr* block_address);
-
-  // Removes an entry from the block files.
-  void DeleteBlock(Addr address);
-
-  // Releases the internal bitmaps. The cache is being purged.
-  void Clear();
-
-  // Sends UMA stats.
-  void ReportStats();
-
-  // Returns true if the blocks pointed by a given address are currently used.
-  // This method is only intended for debugging.
-  bool IsValid(Addr address);
-
- private:
-  // Returns the header number that stores a given address.
-  int GetHeaderNumber(Addr address);
-
-  // Returns the appropriate header to use for a new block.
-  int HeaderNumberForNewBlock(FileType block_type, int block_count);
-
-  // Retrieves stats for the given file index.
-  void GetFileStats(int index, int* used_count, int* load);
-
-  BlockFilesBitmaps bitmaps_;
-
-  DISALLOW_COPY_AND_ASSIGN(BlockBitmaps);
-};
-
-}  // namespace disk_cache
-
-#endif  // NET_DISK_CACHE_BLOCKFILE_BLOCK_BITMAPS_V3_H_