Update {virtual,override} to follow C++11 style in sync.

sync/internal_api/sync_manager_impl_unittest.cc

 // Copyright 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.
 
 // Unit tests for the SyncApi. Note that a lot of the underlying
 // functionality is provided by the Syncable layer, which has its own
 // unit tests. We'll test SyncApi specific things in this harness.
 
 #include <cstddef>
 #include <map>
@@ skipping 885 matching lines @@
     (*out)[PRIORITY_PREFERENCES] = GROUP_PASSIVE;
     (*out)[ARTICLES] = GROUP_PASSIVE;
   }
 
   ModelTypeSet GetEnabledTypes() {
     ModelSafeRoutingInfo routing_info;
     GetModelSafeRoutingInfo(&routing_info);
     return GetRoutingInfoTypes(routing_info);
   }
 
-  virtual void OnChangesApplied(
+  void OnChangesApplied(
       ModelType model_type,
       int64 model_version,
       const BaseTransaction* trans,
       const ImmutableChangeRecordList& changes) override {}
 
-  virtual void OnChangesComplete(ModelType model_type) override {}
+  void OnChangesComplete(ModelType model_type) override {}
 
   // Helper methods.
   bool SetUpEncryption(NigoriStatus nigori_status,
                        EncryptionStatus encryption_status) {
     UserShare* share = sync_manager_.GetUserShare();
 
     // We need to create the nigori node as if it were an applied server update.
     int64 nigori_id = GetIdForDataType(NIGORI);
     if (nigori_id == kInvalidId)
       return false;
@@ skipping 2274 matching lines @@
 // SyncManagerInitInvalidStorageTest::GetFactory will return
 // DirectoryBackingStore that ensures that SyncManagerImpl::OpenDirectory fails.
 // SyncManagerImpl initialization is done in SyncManagerTest::SetUp. This test's
 // task is to ensure that SyncManagerImpl reported initialization failure in
 // OnInitializationComplete callback.
 TEST_F(SyncManagerInitInvalidStorageTest, FailToOpenDatabase) {
   EXPECT_FALSE(initialization_succeeded_);
 }
 
 }  // namespace syncer