Standardize usage of virtual/override/final specifiers.

media/video/capture/fake_video_capture_device_unittest.cc

Index: media/video/capture/fake_video_capture_device_unittest.cc
diff --git a/media/video/capture/fake_video_capture_device_unittest.cc b/media/video/capture/fake_video_capture_device_unittest.cc
index 451e710c770a217bacd1b642ca89c79a8fd0c1bf..7d1fabedfb402a6401948474fc02a3c3cb718417 100644
--- a/media/video/capture/fake_video_capture_device_unittest.cc
+++ b/media/video/capture/fake_video_capture_device_unittest.cc
@@ -83,8 +83,7 @@ class FakeVideoCaptureDeviceTest : public testing::Test {
     device_enumeration_listener_ = new DeviceEnumerationListener();
   }
 
-  virtual void SetUp() {
-  }
+  void SetUp() override {}
 
   void OnFrameCaptured(const VideoCaptureFormat& format) {
     last_format_ = format;