Standardize usage of virtual/override/final in sync/

sync/internal_api/public/attachments/attachment_uploader_impl.h

 // 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.
 
 #ifndef SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_UPLOADER_IMPL_H_
 #define SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_UPLOADER_IMPL_H_
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/gtest_prod_util.h"
 #include "base/threading/non_thread_safe.h"
@@ skipping 23 matching lines @@
   //
   // |token_service_provider| provides an OAuth2 token service.
   AttachmentUploaderImpl(
       const GURL& sync_service_url,
       const scoped_refptr<net::URLRequestContextGetter>&
           url_request_context_getter,
       const std::string& account_id,
       const OAuth2TokenService::ScopeSet& scopes,
       const scoped_refptr<OAuth2TokenServiceRequest::TokenServiceProvider>&
           token_service_provider);
-  virtual ~AttachmentUploaderImpl();
+  ~AttachmentUploaderImpl() override;
 
   // AttachmentUploader implementation.
-  virtual void UploadAttachment(const Attachment& attachment,
-                                const UploadCallback& callback) override;
+  void UploadAttachment(const Attachment& attachment,
+                        const UploadCallback& callback) override;
 
   // Return the URL for the given |sync_service_url| and |attachment_id|.
   static GURL GetURLForAttachmentId(const GURL& sync_service_url,
                                     const AttachmentId& attachment_id);
 
   // Return the crc32c of the memory described by |data| and |size|.
   //
   // The value is base64 encoded, big-endian format.  Suitable for use in the
   // X-Goog-Hash header
   // (https://cloud.google.com/storage/docs/reference-headers#xgooghash).
@@ skipping 18 matching lines @@
 
   // Must be last data member.
   base::WeakPtrFactory<AttachmentUploaderImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AttachmentUploaderImpl);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_UPLOADER_IMPL_H_