Standardize usage of virtual/override/final in chrome/

chrome/test/chromedriver/chrome/chrome_android_impl.h

Index: chrome/test/chromedriver/chrome/chrome_android_impl.h
diff --git a/chrome/test/chromedriver/chrome/chrome_android_impl.h b/chrome/test/chromedriver/chrome/chrome_android_impl.h
index ae86a573b28b7b2dcfc795db6215ffff7849f89f..2fe76eef6f3aba3a0fd2aacef74e8c32de0ebe25 100644
--- a/chrome/test/chromedriver/chrome/chrome_android_impl.h
+++ b/chrome/test/chromedriver/chrome/chrome_android_impl.h
@@ -23,13 +23,13 @@ class ChromeAndroidImpl : public ChromeImpl {
       ScopedVector<DevToolsEventListener>& devtools_event_listeners,
       scoped_ptr<PortReservation> port_reservation,
       scoped_ptr<Device> device);
-  virtual ~ChromeAndroidImpl();
+  ~ChromeAndroidImpl() override;
 
   // Overridden from Chrome:
-  virtual std::string GetOperatingSystemName() override;
+  std::string GetOperatingSystemName() override;
 
   // Overridden from ChromeImpl:
-  virtual Status QuitImpl() override;
+  Status QuitImpl() override;
 
  private:
   scoped_ptr<Device> device_;