Change other usages of .size() to .empty() when applicable.

chrome/browser/sync/engine/syncapi.cc

 // Copyright (c) 2010 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/sync/engine/syncapi.h"
 
 #include <algorithm>
 #include <bitset>
 #include <iomanip>
 #include <list>
@@ skipping 2421 matching lines @@
       if (!node.InitByTagLookup(kNigoriTag)) {
         DCHECK(!event.snapshot->is_share_usable);
         return;
       }
       const sync_pb::NigoriSpecifics& nigori = node.GetNigoriSpecifics();
       syncable::ModelTypeSet encrypted_types =
           syncable::GetEncryptedDataTypesFromNigori(nigori);
       // If passwords are enabled, they're automatically considered encrypted.
       if (enabled_types.count(syncable::PASSWORDS) > 0)
         encrypted_types.insert(syncable::PASSWORDS);
-      if (encrypted_types.size() > 0) {
+      if (!encrypted_types.empty()) {
         Cryptographer* cryptographer =
             GetUserShare()->dir_manager->cryptographer();
         if (!cryptographer->is_ready() && !cryptographer->has_pending_keys()) {
           if (!nigori.encrypted().blob().empty()) {
             DCHECK(!cryptographer->CanDecrypt(nigori.encrypted()));
             cryptographer->SetPendingKeys(nigori.encrypted());
           }
         }
 
         // If we've completed a sync cycle and the cryptographer isn't ready
@@ skipping 369 matching lines @@
 
 void SyncManager::TriggerOnIncomingNotificationForTest(
     const syncable::ModelTypeBitSet& model_types) {
   IncomingNotificationData notification_data;
   notification_data.service_url = model_types.to_string();
   // Here we rely on the default notification method being SERVER.
   data_->OnIncomingNotification(notification_data);
 }
 
 }  // namespace sync_api