Standardize usage of virtual/override/final specifiers.

remoting/host/config_file_watcher_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.
 
 #include "remoting/host/config_file_watcher.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 21 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ConfigFileWatcherDelegate);
 };
 
 }  // namespace
 
 class ConfigFileWatcherTest : public testing::Test {
  public:
   ConfigFileWatcherTest();
-  virtual ~ConfigFileWatcherTest();
+  ~ConfigFileWatcherTest() override;
 
   // testing::Test overrides
-  virtual void SetUp() override;
-  virtual void TearDown() override;
+  void SetUp() override;
+  void TearDown() override;
 
   // Stops the config file watcher.
   void StopWatcher();
 
  protected:
   base::MessageLoopForUI message_loop_;
   base::RunLoop run_loop_;
 
   ConfigFileWatcherDelegate delegate_;
 
@@ skipping 68 matching lines @@
 
   // Modify the watched file.
   std::string data("test");
   EXPECT_NE(base::WriteFile(config_file_, data.c_str(),
                                  static_cast<int>(data.size())), -1);
 
   run_loop_.Run();
 }
 
 }  // namespace remoting