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diff --git a/src/leveldb/include/leveldb/filter_policy.h b/src/leveldb/include/leveldb/filter_policy.h
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--- a/src/leveldb/include/leveldb/filter_policy.h
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-// Copyright (c) 2012 The LevelDB 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 the AUTHORS file for names of contributors.
-//
-// A database can be configured with a custom FilterPolicy object.
-// This object is responsible for creating a small filter from a set
-// of keys.  These filters are stored in leveldb and are consulted
-// automatically by leveldb to decide whether or not to read some
-// information from disk. In many cases, a filter can cut down the
-// number of disk seeks form a handful to a single disk seek per
-// DB::Get() call.
-//
-// Most people will want to use the builtin bloom filter support (see
-// NewBloomFilterPolicy() below).
-
-#ifndef STORAGE_LEVELDB_INCLUDE_FILTER_POLICY_H_
-#define STORAGE_LEVELDB_INCLUDE_FILTER_POLICY_H_
-
-#include <string>
-
-namespace leveldb {
-
-class Slice;
-
-class FilterPolicy {
- public:
-  virtual ~FilterPolicy();
-
-  // Return the name of this policy.  Note that if the filter encoding
-  // changes in an incompatible way, the name returned by this method
-  // must be changed.  Otherwise, old incompatible filters may be
-  // passed to methods of this type.
-  virtual const char* Name() const = 0;
-
-  // keys[0,n-1] contains a list of keys (potentially with duplicates)
-  // that are ordered according to the user supplied comparator.
-  // Append a filter that summarizes keys[0,n-1] to *dst.
-  //
-  // Warning: do not change the initial contents of *dst.  Instead,
-  // append the newly constructed filter to *dst.
-  virtual void CreateFilter(const Slice* keys, int n, std::string* dst)
-      const = 0;
-
-  // "filter" contains the data appended by a preceding call to
-  // CreateFilter() on this class.  This method must return true if
-  // the key was in the list of keys passed to CreateFilter().
-  // This method may return true or false if the key was not on the
-  // list, but it should aim to return false with a high probability.
-  virtual bool KeyMayMatch(const Slice& key, const Slice& filter) const = 0;
-};
-
-// Return a new filter policy that uses a bloom filter with approximately
-// the specified number of bits per key.  A good value for bits_per_key
-// is 10, which yields a filter with ~ 1% false positive rate.
-//
-// Callers must delete the result after any database that is using the
-// result has been closed.
-//
-// Note: if you are using a custom comparator that ignores some parts
-// of the keys being compared, you must not use NewBloomFilterPolicy()
-// and must provide your own FilterPolicy that also ignores the
-// corresponding parts of the keys.  For example, if the comparator
-// ignores trailing spaces, it would be incorrect to use a
-// FilterPolicy (like NewBloomFilterPolicy) that does not ignore
-// trailing spaces in keys.
-extern const FilterPolicy* NewBloomFilterPolicy(int bits_per_key);
-
-}
-
-#endif  // STORAGE_LEVELDB_INCLUDE_FILTER_POLICY_H_