Standardize usage of virtual/override/final specifiers.

chrome/browser/spellchecker/feedback_sender_unittest.cc

 // Copyright (c) 2013 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 |FeedbackSender| object.
 
 #include "chrome/browser/spellchecker/feedback_sender.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 48 matching lines @@
 }  // namespace
 
 // A test fixture to help keep tests simple.
 class FeedbackSenderTest : public testing::Test {
  public:
   FeedbackSenderTest() : ui_thread_(content::BrowserThread::UI, &loop_) {
     feedback_.reset(new FeedbackSender(NULL, kLanguage, kCountry));
     feedback_->StartFeedbackCollection();
   }
 
-  virtual ~FeedbackSenderTest() {}
+  ~FeedbackSenderTest() override {}
 
  protected:
   // Appends the "--enable-spelling-service-feedback" switch to the
   // command-line.
   void AppendCommandLineSwitch() {
     // The command-line switch is temporary.
     // TODO(rouslan): Remove the command-line switch. http://crbug.com/247726
     CommandLine::ForCurrentProcess()->AppendSwitch(
         switches::kEnableSpellingFeedbackFieldTrial);
     feedback_.reset(new FeedbackSender(NULL, kLanguage, kCountry));
@@ skipping 535 matching lines @@
   AddPendingFeedback();
   feedback_->OnReceiveDocumentMarkers(kRendererProcessId,
                                       std::vector<uint32>());
   feedback_->StartFeedbackCollection();
   feedback_->OnReceiveDocumentMarkers(kRendererProcessId,
                                       std::vector<uint32>());
   EXPECT_FALSE(IsUploadingData());
 }
 
 }  // namespace spellcheck