Standardize usage of virtual/override/final specifiers in base/.

base/files/file_path_watcher_browsertest.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_path_watcher.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <aclapi.h>
 #elif defined(OS_POSIX)
@@ skipping 125 matching lines @@
                            base::Bind(&TestDelegateBase::OnFileChanged,
                                       delegate->AsWeakPtr()));
   completion->Signal();
 }
 
 class FilePathWatcherTest : public testing::Test {
  public:
   FilePathWatcherTest()
       : file_thread_("FilePathWatcherTest") {}
 
-  virtual ~FilePathWatcherTest() {}
+  ~FilePathWatcherTest() override {}
 
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     // Create a separate file thread in order to test proper thread usage.
     base::Thread::Options options(MessageLoop::TYPE_IO, 0);
     ASSERT_TRUE(file_thread_.StartWithOptions(options));
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     collector_ = new NotificationCollector();
   }
 
-  virtual void TearDown() override {
-    RunLoop().RunUntilIdle();
-  }
+  void TearDown() override { RunLoop().RunUntilIdle(); }
 
   void DeleteDelegateOnFileThread(TestDelegate* delegate) {
     file_thread_.message_loop_proxy()->DeleteSoon(FROM_HERE, delegate);
   }
 
   FilePath test_file() {
     return temp_dir_.path().AppendASCII("FilePathWatcherTest");
   }
 
   FilePath test_link() {
@@ skipping 693 matching lines @@
   ASSERT_TRUE(ChangeFilePermissions(test_dir1, Execute, false));
   ASSERT_TRUE(WaitForEvents());
   ASSERT_TRUE(ChangeFilePermissions(test_dir1, Execute, true));
   DeleteDelegateOnFileThread(delegate.release());
 }
 
 #endif  // OS_MACOSX
 }  // namespace
 
 }  // namespace base