Remove disk_cache::BackendImpl::OpenPrevEntry() and all users.

net/disk_cache/blockfile/backend_impl_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 of the cache.
 
 #ifndef NET_DISK_CACHE_BLOCKFILE_BACKEND_IMPL_V3_H_
 #define NET_DISK_CACHE_BLOCKFILE_BACKEND_IMPL_V3_H_
 
 #include "base/containers/hash_tables.h"
@@ skipping 37 matching lines @@
   };
 
   BackendImplV3(const base::FilePath& path,
                 const scoped_refptr<base::SingleThreadTaskRunner>& cache_thread,
                 net::NetLog* net_log);
   virtual ~BackendImplV3();
 
   // Performs general initialization for this current instance of the cache.
   int Init(const CompletionCallback& callback);
 
-  // Same behavior as OpenNextEntry but walks the list from back to front.
-  int OpenPrevEntry(void** iter, Entry** prev_entry,
-                    const CompletionCallback& callback);
-
   // Sets the maximum size for the total amount of data stored by this instance.
   bool SetMaxSize(int max_bytes);
 
   // Sets the cache type for this backend.
   void SetType(net::CacheType type);
 
   // Creates a new storage block of size block_count.
   bool CreateBlock(FileType block_type, int block_count,
                    Addr* block_address);
 
@@ skipping 137 matching lines @@
   void RestartCache(bool failure);
   void PrepareForRestart();
 
   // Performs final cleanup.
   void CleanupCache();
 
   // Creates a new entry object. Returns zero on success, or a disk_cache error
   // on failure.
   int NewEntry(Addr address, EntryImplV3** entry);
 
-  // Opens the next or previous entry on a cache iteration.
-  int OpenFollowingEntry(bool forward, void** iter, Entry** next_entry,
-                         const CompletionCallback& callback);
-
   // Handles the used storage count.
   void AddStorageSize(int32 bytes);
   void SubstractStorageSize(int32 bytes);
 
   // Update the number of referenced cache entries.
   void IncreaseNumRefs();
   void DecreaseNumRefs();
   void IncreaseNumEntries();
   void DecreaseNumEntries();
 
@@ skipping 47 matching lines @@
   scoped_ptr<base::RepeatingTimer<BackendImplV3> > timer_;  // Usage timer.
   scoped_refptr<TraceObject> trace_object_;  // Initializes internal tracing.
   base::WeakPtrFactory<BackendImplV3> ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BackendImplV3);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_BLOCKFILE_BACKEND_IMPL_V3_H_