Remove base's implicit_cast.

components/history/core/browser/visitsegment_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 "components/history/core/browser/visitsegment_database.h"
 
 #include <math.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 240 matching lines @@
     score += recency_boost * day_visits_score;
   }
 
   if (pud) {
     pud->SetScore(score);
     results->push_back(pud);
   }
 
   // Limit to the top kResultCount results.
   std::sort(results->begin(), results->end(), PageUsageData::Predicate);
-  if (static_cast<int>(results->size()) > max_result_count) {
+  DCHECK_GE(max_result_count, 0);
+  if (results->size() > static_cast<size_t>(max_result_count)) {
     STLDeleteContainerPointers(results->begin() + max_result_count,
                                results->end());
     results->resize(max_result_count);
   }
 
   // Now fetch the details about the entries we care about.
   sql::Statement statement2(GetDB().GetCachedStatement(SQL_FROM_HERE,
       "SELECT urls.url, urls.title FROM urls "
       "JOIN segments ON segments.url_id = urls.id "
       "WHERE segments.id = ?"));
@@ skipping 45 matching lines @@
                       "name VARCHAR,"
                       "url_id INTEGER NON NULL)") &&
       GetDB().Execute("INSERT INTO segments_tmp SELECT "
                       "id, name, url_id FROM segments") &&
       GetDB().Execute("DROP TABLE segments") &&
       GetDB().Execute("ALTER TABLE segments_tmp RENAME TO segments") &&
       transaction.Commit();
 }
 
 }  // namespace history