Cleanup: Remove unneeded headers from base/ (part 1)

net/disk_cache/backend_impl.cc

 // Copyright (c) 2006-2010 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.
 
 #include "net/disk_cache/backend_impl.h"
 
 #include "base/field_trial.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/histogram.h"
 #include "base/message_loop.h"
-#include "base/rand_util.h"
 #include "base/string_util.h"
 #include "base/sys_info.h"
 #include "base/timer.h"
 #include "base/worker_pool.h"
 #include "net/base/net_errors.h"
 #include "net/disk_cache/cache_util.h"
 #include "net/disk_cache/entry_impl.h"
 #include "net/disk_cache/errors.h"
 #include "net/disk_cache/hash.h"
 #include "net/disk_cache/file.h"
@@ skipping 1837 matching lines @@
 
   return num_dirty;
 }
 
 bool BackendImpl::CheckEntry(EntryImpl* cache_entry) {
   RankingsNode* rankings = cache_entry->rankings()->Data();
   return !rankings->dummy;
 }
 
 }  // namespace disk_cache