Remove the flash specific disk cache backend.

net/disk_cache/flash/flash_entry_impl.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.
-
-#ifndef NET_DISK_CACHE_FLASH_ENTRY_IMPL_H_
-#define NET_DISK_CACHE_FLASH_ENTRY_IMPL_H_
-
-#include <string>
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "net/base/net_export.h"
-#include "net/disk_cache/disk_cache.h"
-#include "net/disk_cache/flash/internal_entry.h"
-
-namespace base {
-
-class MessageLoopProxy;
-
-}  // namespace base
-
-namespace disk_cache {
-
-class InternalEntry;
-class IOBuffer;
-class LogStore;
-
-// We use split objects to minimize the context switches between the main thread
-// and the cache thread in the most common case of creating a new entry.
-//
-// All calls on a new entry are served synchronously.  When an object is
-// destructed (via final Close() call), a message is posted to the cache thread
-// to save the object to storage.
-//
-// When an entry is not new, every asynchronous call is posted to the cache
-// thread, just as before; synchronous calls like GetKey() and GetDataSize() are
-// served from the main thread.
-class NET_EXPORT_PRIVATE FlashEntryImpl
-    : public Entry,
-      public base::RefCountedThreadSafe<FlashEntryImpl> {
-  friend class base::RefCountedThreadSafe<FlashEntryImpl>;
- public:
-  FlashEntryImpl(const std::string& key,
-                 LogStore* store,
-                 base::MessageLoopProxy* cache_thread);
-  FlashEntryImpl(int32 id,
-                 LogStore* store,
-                 base::MessageLoopProxy* cache_thread);
-
-  int Init(const CompletionCallback& callback);
-
-  // disk_cache::Entry interface.
-  virtual void Doom() OVERRIDE;
-  virtual void Close() OVERRIDE;
-  virtual std::string GetKey() const OVERRIDE;
-  virtual base::Time GetLastUsed() const OVERRIDE;
-  virtual base::Time GetLastModified() const OVERRIDE;
-  virtual int32 GetDataSize(int index) const OVERRIDE;
-  virtual int ReadData(int index, int offset, IOBuffer* buf, int buf_len,
-                       const CompletionCallback& callback) OVERRIDE;
-  virtual int WriteData(int index, int offset, IOBuffer* buf, int buf_len,
-                        const CompletionCallback& callback,
-                        bool truncate) OVERRIDE;
-  virtual int ReadSparseData(int64 offset, IOBuffer* buf, int buf_len,
-                             const CompletionCallback& callback) OVERRIDE;
-  virtual int WriteSparseData(int64 offset, IOBuffer* buf, int buf_len,
-                              const CompletionCallback& callback) OVERRIDE;
-  virtual int GetAvailableRange(int64 offset, int len, int64* start,
-                                const CompletionCallback& callback) OVERRIDE;
-  virtual bool CouldBeSparse() const OVERRIDE;
-  virtual void CancelSparseIO() OVERRIDE;
-  virtual int ReadyForSparseIO(const CompletionCallback& callback) OVERRIDE;
-
- private:
-  void OnInitComplete(scoped_ptr<KeyAndStreamSizes> key_and_stream_sizes);
-  virtual ~FlashEntryImpl();
-
-  bool init_;
-  std::string key_;
-  int stream_sizes_[kFlashLogStoreEntryNumStreams];
-
-  // Used if |this| is an newly created entry.
-  scoped_refptr<InternalEntry> new_internal_entry_;
-
-  // Used if |this| is an existing entry.
-  scoped_refptr<InternalEntry> old_internal_entry_;
-
-  // Copy of the callback for asynchronous calls on |old_internal_entry_|.
-  CompletionCallback callback_;
-
-  scoped_refptr<base::MessageLoopProxy> cache_thread_;
-
-  DISALLOW_COPY_AND_ASSIGN(FlashEntryImpl);
-};
-
-}  // namespace disk_cache
-
-#endif  // NET_DISK_CACHE_FLASH_ENTRY_IMPL_H_