Clean up a few more unused globals.

chrome/browser/history/expire_history_backend.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/history/expire_history_backend.h"
 
 #include <algorithm>
 #include <functional>
 #include <limits>
 
@@ skipping 118 matching lines @@
 // last expiration found at least kNumExpirePerIteration and we want to check
 // again "soon."
 const int kExpirationDelaySec = 30;
 
 // The number of minutes between checking, as with kExpirationDelaySec, but
 // when we didn't find enough things to expire last time. If there was no
 // history to expire last iteration, it's likely there is nothing next
 // iteration, so we want to wait longer before checking to avoid wasting CPU.
 const int kExpirationEmptyDelayMin = 5;
 
-// The number of minutes that we wait for before scheduling a task to
-// delete old history index files.
-const int kIndexExpirationDelayMin = 2;
-
-// The number of the most recent months for which we do not want to delete
-// the history index files.
-const int kStoreHistoryIndexesForMonths = 3;
-
 }  // namespace
 
 struct ExpireHistoryBackend::DeleteDependencies {
   // The time range affected. These can be is_null() to be unbounded in one
   // or both directions.
   base::Time begin_time, end_time;
 
   // ----- Filled by DeleteVisitRelatedInfo or manually if a function doesn't
   //       call that function. -----
 
@@ skipping 529 matching lines @@
   // We use the bookmark service to determine if a URL is bookmarked. The
   // bookmark service is loaded on a separate thread and may not be done by the
   // time we get here. We therefor block until the bookmarks have finished
   // loading.
   if (bookmark_service_)
     bookmark_service_->BlockTillLoaded();
   return bookmark_service_;
 }
 
 }  // namespace history