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

content/browser/gpu/gpu_data_manager_impl_private_unittest.cc

Index: content/browser/gpu/gpu_data_manager_impl_private_unittest.cc
diff --git a/content/browser/gpu/gpu_data_manager_impl_private_unittest.cc b/content/browser/gpu/gpu_data_manager_impl_private_unittest.cc
index 312dd9e0463030d5e5c634581b9e827f6a41ebdb..00963fe3eb9f04920a9eaca420f9c66a15ddad60 100644
--- a/content/browser/gpu/gpu_data_manager_impl_private_unittest.cc
+++ b/content/browser/gpu/gpu_data_manager_impl_private_unittest.cc
@@ -29,18 +29,16 @@ class TestObserver : public GpuDataManagerObserver {
       : gpu_info_updated_(false),
         video_memory_usage_stats_updated_(false) {
   }
-  virtual ~TestObserver() { }
+  ~TestObserver() override {}
 
   bool gpu_info_updated() const { return gpu_info_updated_; }
   bool video_memory_usage_stats_updated() const {
     return video_memory_usage_stats_updated_;
   }
 
-  virtual void OnGpuInfoUpdate() override {
-    gpu_info_updated_ = true;
-  }
+  void OnGpuInfoUpdate() override { gpu_info_updated_ = true; }
 
-  virtual void OnVideoMemoryUsageStatsUpdate(
+  void OnVideoMemoryUsageStatsUpdate(
       const GPUVideoMemoryUsageStats& stats) override {
     video_memory_usage_stats_updated_ = true;
   }