Standardize usage of virtual/override/final specifiers.

content/browser/download/base_file_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 "content/browser/download/base_file.h"
 
 #include "base/files/file.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
@@ skipping 27 matching lines @@
  public:
   static const unsigned char kEmptySha256Hash[crypto::kSHA256Length];
 
   BaseFileTest()
       : expect_file_survives_(false),
         expect_in_progress_(true),
         expected_error_(DOWNLOAD_INTERRUPT_REASON_NONE),
         file_thread_(BrowserThread::FILE, &message_loop_) {
   }
 
-  virtual void SetUp() {
+  void SetUp() override {
     ResetHash();
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     base_file_.reset(new BaseFile(base::FilePath(),
                                   GURL(),
                                   GURL(),
                                   0,
                                   false,
                                   std::string(),
                                   base::File(),
                                   net::BoundNetLog()));
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     EXPECT_FALSE(base_file_->in_progress());
     if (!expected_error_) {
       EXPECT_EQ(static_cast<int64>(expected_data_.size()),
                 base_file_->bytes_so_far());
     }
 
     base::FilePath full_path = base_file_->full_path();
 
     if (!expected_data_.empty() && !expected_error_) {
       // Make sure the data has been properly written to disk.
@@ skipping 612 matching lines @@
 
   const char kData[] = "hello";
   const int kDataLength = static_cast<int>(arraysize(kData) - 1);
   ASSERT_EQ(kDataLength, base::WriteFile(full_path, kData, kDataLength));
   // The file that we created here should stick around when the BaseFile is
   // destroyed during TearDown.
   expect_file_survives_ = true;
 }
 
 }  // namespace content