Standardize usage of virtual/override/final in chrome/

chrome/test/chromedriver/chrome/dom_tracker_unittest.cc

Index: chrome/test/chromedriver/chrome/dom_tracker_unittest.cc
diff --git a/chrome/test/chromedriver/chrome/dom_tracker_unittest.cc b/chrome/test/chromedriver/chrome/dom_tracker_unittest.cc
index 4a5b9ae9baff8dcec18a520f96c6759d3ce4fc6b..2deeb09220719e729915c1e5fa667e052d57f3a9 100644
--- a/chrome/test/chromedriver/chrome/dom_tracker_unittest.cc
+++ b/chrome/test/chromedriver/chrome/dom_tracker_unittest.cc
@@ -17,7 +17,7 @@ namespace {
 class FakeDevToolsClient : public StubDevToolsClient {
  public:
   FakeDevToolsClient() {}
-  virtual ~FakeDevToolsClient() {}
+  ~FakeDevToolsClient() override {}
 
   std::string PopSentCommand() {
     std::string command;
@@ -29,12 +29,12 @@ class FakeDevToolsClient : public StubDevToolsClient {
   }
 
   // Overridden from DevToolsClient:
-  virtual Status SendCommand(const std::string& method,
-                             const base::DictionaryValue& params) override {
+  Status SendCommand(const std::string& method,
+                     const base::DictionaryValue& params) override {
     sent_command_queue_.push_back(method);
     return Status(kOk);
   }
-  virtual Status SendCommandAndGetResult(
+  Status SendCommandAndGetResult(
       const std::string& method,
       const base::DictionaryValue& params,
       scoped_ptr<base::DictionaryValue>* result) override {