Disk Cache: Delete chained block files when they become empty....

net/disk_cache/block_files.h

 // Copyright (c) 2006-2008 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_BLOCK_FILES_H__
 #define NET_DISK_CACHE_BLOCK_FILES_H__
 
 #include <vector>
@@ skipping 43 matching lines @@
 
   // Returns the appropriate file to use for a new block.
   MappedFile* FileForNewBlock(FileType block_type, int block_count);
 
   // Returns the next block file on this chain, creating new files if needed.
   MappedFile* NextFile(const MappedFile* file);
 
   // Creates an empty block file and returns its index.
   int CreateNextBlockFile(FileType block_type);
 
+  // Removes a chained block file that is now empty.
+  void RemoveEmptyFile(FileType block_type);
+
   // Restores the header of a potentially inconsistent file.
   bool FixBlockFileHeader(MappedFile* file);
 
   // Returns the filename for a given file index.
   std::wstring Name(int index);
 
   bool init_;
   char* zero_buffer_;  // Buffer to speed-up cleaning deleted entries.
   std::wstring path_;  // Path to the backing folder.
   std::vector<MappedFile*> block_files_;  // The actual files.
 
   DISALLOW_EVIL_CONSTRUCTORS(BlockFiles);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_BLOCK_FILES_H__