Standardize usage of virtual/override/final specifiers.

chrome/renderer/spellchecker/spellcheck_unittest.cc

 // Copyright (c) 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.
 
 #include "base/files/file_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/common/chrome_paths.h"
@@ skipping 52 matching lines @@
     spell_check_->spellcheck_.platform_spelling_engine_.reset(
         new HunspellEngine);
 #endif
     spell_check_->Init(file.Pass(), std::set<std::string>(), language);
   }
 
   void EnableAutoCorrect(bool enable_autocorrect) {
     spell_check_->OnEnableAutoSpellCorrect(enable_autocorrect);
   }
 
-  virtual ~SpellCheckTest() {
-  }
+  ~SpellCheckTest() override {}
 
   SpellCheck* spell_check() { return spell_check_.get(); }
 
   bool CheckSpelling(const std::string& word, int tag) {
     return spell_check_->spellcheck_.platform_spelling_engine_->CheckSpelling(
         base::ASCIIToUTF16(word), tag);
   }
 
 #if !defined(OS_MACOSX)
  protected:
@@ skipping 1279 matching lines @@
         strlen(kTestCases[i].misspelled),
         0,
         &misspelling_start,
         &misspelling_length,
         &suggestions));
     EXPECT_GE(suggestions.size(), static_cast<size_t>(1));
     if (suggestions.size() > 0)
       EXPECT_EQ(suggestions[0], base::ASCIIToUTF16(kTestCases[i].suggestion));
   }
 }