Standardize usage of virtual/override/final specifiers.

content/browser/gamepad/gamepad_platform_data_fetcher_linux.h

Index: content/browser/gamepad/gamepad_platform_data_fetcher_linux.h
diff --git a/content/browser/gamepad/gamepad_platform_data_fetcher_linux.h b/content/browser/gamepad/gamepad_platform_data_fetcher_linux.h
index 62e6482eb646c8c974056655c906db610c8515d1..dab9497fef02cbc00c1ec43c9c735947cbc60453 100644
--- a/content/browser/gamepad/gamepad_platform_data_fetcher_linux.h
+++ b/content/browser/gamepad/gamepad_platform_data_fetcher_linux.h
@@ -25,11 +25,11 @@ class UdevLinux;
 class GamepadPlatformDataFetcherLinux : public GamepadDataFetcher {
  public:
   GamepadPlatformDataFetcherLinux();
-  virtual ~GamepadPlatformDataFetcherLinux();
+  ~GamepadPlatformDataFetcherLinux() override;
 
   // GamepadDataFetcher implementation.
-  virtual void GetGamepadData(blink::WebGamepads* pads,
-                              bool devices_changed_hint) override;
+  void GetGamepadData(blink::WebGamepads* pads,
+                      bool devices_changed_hint) override;
 
  private:
   void RefreshDevice(udev_device* dev);