Standardize usage of virtual/override/final specifiers in sync/.

sync/internal_api/attachments/attachment_service_impl_unittest.cc

 // Copyright 2014 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 "sync/internal_api/public/attachments/attachment_service_impl.h"
 
 #include "base/bind.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 158 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(MockAttachmentUploader);
 };
 
 }  // namespace
 
 class AttachmentServiceImplTest : public testing::Test,
                                   public AttachmentService::Delegate {
  protected:
   AttachmentServiceImplTest() {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     network_change_notifier_.reset(net::NetworkChangeNotifier::CreateMock());
     InitializeAttachmentService(make_scoped_ptr(new MockAttachmentUploader()),
                                 make_scoped_ptr(new MockAttachmentDownloader()),
                                 this);
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     attachment_service_.reset();
     ASSERT_FALSE(attachment_store_);
     ASSERT_FALSE(attachment_uploader_);
     ASSERT_FALSE(attachment_downloader_);
   }
 
   // AttachmentService::Delegate implementation.
   void OnAttachmentUploaded(const AttachmentId& attachment_id) override {
     on_attachment_uploaded_list_.push_back(attachment_id);
   }
@@ skipping 389 matching lines @@
   net::NetworkChangeNotifier::NotifyObserversOfNetworkChangeForTests(
       net::NetworkChangeNotifier::CONNECTION_WIFI);
   RunLoop();
 
   // No longer in backoff.
   ASSERT_TRUE(mock_timer()->IsRunning());
   ASSERT_EQ(base::TimeDelta(), mock_timer()->GetCurrentDelay());
 }
 
 }  // namespace syncer