Standardize usage of virtual/override/final in sync/

sync/internal_api/attachments/attachment_store_handle_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_store_handle.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 12 matching lines @@
  public:
   MockAttachmentStore(const base::Closure& read_called,
                       const base::Closure& write_called,
                       const base::Closure& drop_called,
                       const base::Closure& dtor_called)
       : read_called_(read_called),
         write_called_(write_called),
         drop_called_(drop_called),
         dtor_called_(dtor_called) {}
 
-  virtual ~MockAttachmentStore() {
-    dtor_called_.Run();
-  }
+  ~MockAttachmentStore() override { dtor_called_.Run(); }
 
-  virtual void Read(const AttachmentIdList& ids,
-                    const ReadCallback& callback) override {
+  void Read(const AttachmentIdList& ids,
+            const ReadCallback& callback) override {
     read_called_.Run();
   }
 
-  virtual void Write(const AttachmentList& attachments,
-                     const WriteCallback& callback) override {
+  void Write(const AttachmentList& attachments,
+             const WriteCallback& callback) override {
     write_called_.Run();
   }
 
-  virtual void Drop(const AttachmentIdList& ids,
-                    const DropCallback& callback) override {
+  void Drop(const AttachmentIdList& ids,
+            const DropCallback& callback) override {
     drop_called_.Run();
   }
 
   base::Closure read_called_;
   base::Closure write_called_;
   base::Closure drop_called_;
   base::Closure dtor_called_;
 };
 
 }  // namespace
@@ skipping 76 matching lines @@
 
   // Releasing referehce to AttachmentStoreHandle should result in
   // MockAttachmentStore being deleted on backend loop.
   attachment_store_handle_ = NULL;
   EXPECT_EQ(dtor_call_count_, 0);
   RunMessageLoop();
   EXPECT_EQ(dtor_call_count_, 1);
 }
 
 }  // namespace syncer