Standardize usage of virtual/override/final in chrome/

chrome/test/chromedriver/command_listener_proxy_unittest.cc

Index: chrome/test/chromedriver/command_listener_proxy_unittest.cc
diff --git a/chrome/test/chromedriver/command_listener_proxy_unittest.cc b/chrome/test/chromedriver/command_listener_proxy_unittest.cc
index 1ecf2461b2ae9686cd402b565250fd1e1ff4a14b..0794daab8e27c64a95c28ee0b749a2fb9b8005a3 100644
--- a/chrome/test/chromedriver/command_listener_proxy_unittest.cc
+++ b/chrome/test/chromedriver/command_listener_proxy_unittest.cc
@@ -15,9 +15,9 @@ namespace {
 class MockCommandListener : public CommandListener {
  public:
   MockCommandListener() : called_(false) {}
-  virtual ~MockCommandListener() {}
+  ~MockCommandListener() override {}
 
-  virtual Status BeforeCommand(const std::string& command_name) override {
+  Status BeforeCommand(const std::string& command_name) override {
     called_ = true;
     EXPECT_STREQ("cmd", command_name.c_str());
     return Status(kOk);