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

net/disk_cache/blockfile/backend_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.
 
 // See net/disk_cache/disk_cache.h for the public interface of the cache.
 
 #ifndef NET_DISK_CACHE_BLOCKFILE_BACKEND_IMPL_H_
 #define NET_DISK_CACHE_BLOCKFILE_BACKEND_IMPL_H_
 
 #include "base/containers/hash_tables.h"
@@ skipping 48 matching lines @@
               net::NetLog* net_log);
   virtual ~BackendImpl();
 
   // Performs general initialization for this current instance of the cache.
   int Init(const CompletionCallback& callback);
 
   // Performs the actual initialization and final cleanup on destruction.
   int SyncInit();
   void CleanupCache();
 
-  // Same behavior as OpenNextEntry but walks the list from back to front.
-  int OpenPrevEntry(void** iter, Entry** prev_entry,
-                    const CompletionCallback& callback);
-
   // Synchronous implementation of the asynchronous interface.
   int SyncOpenEntry(const std::string& key, Entry** entry);
   int SyncCreateEntry(const std::string& key, Entry** entry);
   int SyncDoomEntry(const std::string& key);
   int SyncDoomAllEntries();
   int SyncDoomEntriesBetween(base::Time initial_time,
                              base::Time end_time);
   int SyncDoomEntriesSince(base::Time initial_time);
   int SyncOpenNextEntry(void** iter, Entry** next_entry);
-  int SyncOpenPrevEntry(void** iter, Entry** prev_entry);
   void SyncEndEnumeration(void* iter);
   void SyncOnExternalCacheHit(const std::string& key);
 
   // Open or create an entry for the given |key| or |iter|.
   EntryImpl* OpenEntryImpl(const std::string& key);
   EntryImpl* CreateEntryImpl(const std::string& key);
   EntryImpl* OpenNextEntryImpl(void** iter);
-  EntryImpl* OpenPrevEntryImpl(void** iter);
 
   // 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);
 
   // Returns the full name for an external storage file.
   base::FilePath GetFileName(Addr address) const;
 
@@ skipping 206 matching lines @@
   // Returns a given entry from the cache. The entry to match is determined by
   // key and hash, and the returned entry may be the matched one or it's parent
   // on the list of entries with the same hash (or bucket). To look for a parent
   // of a given entry, |entry_addr| should be grabbed from that entry, so that
   // if it doesn't match the entry on the index, we know that it was replaced
   // with a new entry; in this case |*match_error| will be set to true and the
   // return value will be NULL.
   EntryImpl* MatchEntry(const std::string& key, uint32 hash, bool find_parent,
                         Addr entry_addr, bool* match_error);
 
-  // Opens the next or previous entry on a cache iteration.
-  EntryImpl* OpenFollowingEntry(bool forward, void** iter);
-
   // Opens the next or previous entry on a single list. If successful,
   // |from_entry| will be updated to point to the new entry, otherwise it will
   // be set to NULL; in other words, it is used as an explicit iterator.
-  bool OpenFollowingEntryFromList(bool forward, Rankings::List list,
+  bool OpenFollowingEntryFromList(Rankings::List list,
                                   CacheRankingsBlock** from_entry,
                                   EntryImpl** next_entry);
 
   // Returns the entry that is pointed by |next|, from the given |list|.
   EntryImpl* GetEnumeratedEntry(CacheRankingsBlock* next, Rankings::List list);
 
   // Re-opens an entry that was previously deleted.
   EntryImpl* ResurrectEntry(EntryImpl* deleted_entry);
 
   void DestroyInvalidEntry(EntryImpl* entry);
@@ skipping 65 matching lines @@
   base::WaitableEvent done_;  // Signals the end of background work.
   scoped_refptr<TraceObject> trace_object_;  // Initializes internal tracing.
   base::WeakPtrFactory<BackendImpl> ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BackendImpl);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_BLOCKFILE_BACKEND_IMPL_H_