Standardize usage of virtual/override/final specifiers.

chrome/browser/sessions/session_backend_unittest.cc

 // Copyright (c) 2011 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/files/scoped_temp_dir.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "chrome/browser/sessions/session_backend.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 14 matching lines @@
           static_cast<SessionCommand::size_type>(data.data.size()));
   if (!data.data.empty())
     memcpy(command->contents(), data.data.c_str(), data.data.size());
   return command;
 }
 
 }  // namespace
 
 class SessionBackendTest : public testing::Test {
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     path_ = temp_dir_.path().Append(FILE_PATH_LITERAL("SessionTestDirs"));
     base::CreateDirectory(path_);
   }
 
   void AssertCommandEqualsData(const TestData& data, SessionCommand* command) {
     EXPECT_EQ(data.command_id, command->id());
     EXPECT_EQ(data.data.size(), command->size());
     EXPECT_TRUE(
         memcmp(command->contents(), data.data.c_str(), command->size()) == 0);
@@ skipping 148 matching lines @@
   backend = NULL;
   backend = new SessionBackend(BaseSessionService::SESSION_RESTORE, path_);
   backend->ReadLastSessionCommandsImpl(&commands);
 
   // And make sure we get back the expected data.
   ASSERT_EQ(1U, commands.size());
   AssertCommandEqualsData(second_data, commands[0]);
 
   STLDeleteElements(&commands);
 }