Standardize usage of virtual/override/final in content/browser/

content/browser/gamepad/gamepad_test_helpers.h

Index: content/browser/gamepad/gamepad_test_helpers.h
diff --git a/content/browser/gamepad/gamepad_test_helpers.h b/content/browser/gamepad/gamepad_test_helpers.h
index 68a6d373dab2365097310e45c4fbd13b5e76b9ac..dbaa96649122b91b9df37d40eefdda819c393e1d 100644
--- a/content/browser/gamepad/gamepad_test_helpers.h
+++ b/content/browser/gamepad/gamepad_test_helpers.h
@@ -23,11 +23,11 @@ class MockGamepadDataFetcher : public GamepadDataFetcher {
   // returned when the provider queries us.
   explicit MockGamepadDataFetcher(const blink::WebGamepads& test_data);
 
-  virtual ~MockGamepadDataFetcher();
+  ~MockGamepadDataFetcher() override;
 
   // GamepadDataFetcher.
-  virtual void GetGamepadData(blink::WebGamepads* pads,
-                              bool devices_changed_hint) override;
+  void GetGamepadData(blink::WebGamepads* pads,
+                      bool devices_changed_hint) override;
 
   // Blocks the current thread until the GamepadProvider reads from this
   // fetcher on the background thread.
@@ -69,7 +69,7 @@ class GamepadTestHelper {
 class GamepadServiceTestConstructor : public GamepadTestHelper {
  public:
   explicit GamepadServiceTestConstructor(const blink::WebGamepads& test_data);
-  virtual ~GamepadServiceTestConstructor();
+  ~GamepadServiceTestConstructor() override;
 
   GamepadService* gamepad_service() { return gamepad_service_; }
   MockGamepadDataFetcher* data_fetcher() { return data_fetcher_; }