Reduce the amount of included header files. Vast change like in "Oh God! This...

net/disk_cache/rankings.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_RANKINGS_H_
 #define NET_DISK_CACHE_RANKINGS_H_
 
 #include <list>
 
+#include "base/scoped_ptr.h"
 #include "net/disk_cache/addr.h"
 #include "net/disk_cache/mapped_file.h"
 #include "net/disk_cache/storage_block.h"
 
 namespace disk_cache {
 
 class BackendImpl;
 
 // Type of crashes generated for the unit tests.
 enum RankCrashes {
@@ skipping 139 matching lines @@
   LruData* control_data_;  // Data related to the LRU lists.
   IteratorList iterators_;
 
   DISALLOW_COPY_AND_ASSIGN(Rankings);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_RANKINGS_H_