Pure pedantry: Replace all ".size() == 0" with ".empty()".

chrome/browser/history/history_backend.cc

 // Copyright (c) 2011 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/history_backend.h"
 
 #include <list>
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 358 matching lines @@
     return;
 
   // Will be filled with the URL ID and the visit ID of the last addition.
   std::pair<URLID, VisitID> last_ids(0, tracker_.GetLastVisit(
       request->id_scope, request->page_id, request->referrer));
 
   VisitID from_visit_id = last_ids.second;
 
   // If a redirect chain is given, we expect the last item in that chain to be
   // the final URL.
-  DCHECK(request->redirects.size() == 0 ||
+  DCHECK(request->redirects.empty() ||
          request->redirects.back() == request->url);
 
   // Avoid duplicating times in the database, at least as long as pages are
   // added in order. However, we don't want to disallow pages from recording
   // times earlier than our last_recorded_time_, because someone might set
   // their machine's clock back.
   if (last_requested_time_ == request->time) {
     last_recorded_time_ = last_recorded_time_ + TimeDelta::FromMicroseconds(1);
   } else {
     last_requested_time_ = request->time;
@@ skipping 1805 matching lines @@
   return true;
 }
 
 BookmarkService* HistoryBackend::GetBookmarkService() {
   if (bookmark_service_)
     bookmark_service_->BlockTillLoaded();
   return bookmark_service_;
 }
 
 }  // namespace history