Fix a race condition in SafeBrowsingDatabaseNew::IsCsdWhitelistKillSwitchOn()

chrome/browser/safe_browsing/safe_browsing_database.cc

 // Copyright (c) 2012 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 "chrome/browser/safe_browsing/safe_browsing_database.h"
 
 #include <algorithm>
 #include <iterator>
 
 #include "base/bind.h"
@@ skipping 1678 matching lines @@
 }
 
 bool SafeBrowsingDatabaseNew::IsMalwareIPMatchKillSwitchOn() {
   SBFullHash malware_kill_switch = SBFullHashForString(kMalwareIPKillSwitchUrl);
   std::vector<SBFullHash> full_hashes;
   full_hashes.push_back(malware_kill_switch);
   return ContainsWhitelistedHashes(csd_whitelist_, full_hashes);
 }
 
 bool SafeBrowsingDatabaseNew::IsCsdWhitelistKillSwitchOn() {
+  base::AutoLock locked(lookup_lock_);
   return csd_whitelist_.second;
 }