Revert of Move prefix_set and parts of s_b_util into a new component safe_browsing_db.

components/safe_browsing_db/safe_browsing_db_util.h

-// Copyright (c) 2015 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.
-//
-// Utilities for the SafeBrowsing DB code.
-
-#ifndef COMPONENTS_SAFE_BROWSING_DB_SAFE_BROWSING_DB_UTIL_H_
-#define COMPONENTS_SAFE_BROWSING_DB_SAFE_BROWSING_DB_UTIL_H_
-
-#include "base/basictypes.h"
-#include "base/strings/string_piece.h"
-
-// A truncated hash's type.
-typedef uint32 SBPrefix;
-
-// A full hash.
-union SBFullHash {
-  char full_hash[32];
-  SBPrefix prefix;
-};
-
-inline bool SBFullHashEqual(const SBFullHash& a, const SBFullHash& b) {
-  return !memcmp(a.full_hash, b.full_hash, sizeof(a.full_hash));
-}
-
-inline bool SBFullHashLess(const SBFullHash& a, const SBFullHash& b) {
-  return memcmp(a.full_hash, b.full_hash, sizeof(a.full_hash)) < 0;
-}
-
-// Generate full hash for the given string.
-SBFullHash SBFullHashForString(const base::StringPiece& str);
-
-// Different types of threats that SafeBrowsing protects against.
-enum SBThreatType {
-  // No threat at all.
-  SB_THREAT_TYPE_SAFE,
-
-  // The URL is being used for phishing.
-  SB_THREAT_TYPE_URL_PHISHING,
-
-  // The URL hosts malware.
-  SB_THREAT_TYPE_URL_MALWARE,
-
-  // The URL hosts unwanted programs.
-  SB_THREAT_TYPE_URL_UNWANTED,
-
-  // The download URL is malware.
-  SB_THREAT_TYPE_BINARY_MALWARE_URL,
-
-  // Url detected by the client-side phishing model.  Note that unlike the
-  // above values, this does not correspond to a downloaded list.
-  SB_THREAT_TYPE_CLIENT_SIDE_PHISHING_URL,
-
-  // The Chrome extension or app (given by its ID) is malware.
-  SB_THREAT_TYPE_EXTENSION,
-
-  // Url detected by the client-side malware IP list. This IP list is part
-  // of the client side detection model.
-  SB_THREAT_TYPE_CLIENT_SIDE_MALWARE_URL,
-};
-
-#endif  // COMPONENTS_SAFE_BROWSING_DB_SAFE_BROWSING_DB_UTIL_H_