Code quality and standards in SimpleBackend.

net/disk_cache/simple/simple_index_file.h

 // Copyright (c) 2013 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_SIMPLE_SIMPLE_INDEX_FILE_H_
 #define NET_DISK_CACHE_SIMPLE_SIMPLE_INDEX_FILE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/hash_tables.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/pickle.h"
 #include "base/port.h"
 #include "net/base/net_export.h"
 #include "net/disk_cache/simple/simple_index.h"
 
-namespace base {
-class TaskRunner;
-}
-
 namespace disk_cache {
 
 const uint64 kSimpleIndexMagicNumber = GG_UINT64_C(0x656e74657220796f);
 
 // Simple Index File format is a pickle serialized data of IndexMetadata and
 // EntryMetadata objects.  The file format is as follows: one instance of
 // serialized |IndexMetadata| followed serialized |EntryMetadata| entries
 // repeated |number_of_entries| amount of times.  To know more about the format,
 // see SimpleIndexFile::Serialize() and SeeSimpleIndexFile::LoadFromDisk()
 // methods.
@@ skipping 48 matching lines @@
     uint32 crc;
   };
 
   DISALLOW_COPY_AND_ASSIGN(SimpleIndexFile);
 };
 
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_SIMPLE_SIMPLE_INDEX_FILE_H_