Standardize usage of virtual/override/final in cc/

cc/base/latency_info_swap_promise_monitor.h

Index: cc/base/latency_info_swap_promise_monitor.h
diff --git a/cc/base/latency_info_swap_promise_monitor.h b/cc/base/latency_info_swap_promise_monitor.h
index cf1dc1d2ddfa96cd76b1e72d8124f2cfaf94f87f..d9e71fbdb65bf438d80886069989857b77a89a99 100644
--- a/cc/base/latency_info_swap_promise_monitor.h
+++ b/cc/base/latency_info_swap_promise_monitor.h
@@ -22,11 +22,11 @@ class CC_EXPORT LatencyInfoSwapPromiseMonitor : public SwapPromiseMonitor {
   LatencyInfoSwapPromiseMonitor(ui::LatencyInfo* latency,
                                 LayerTreeHost* layer_tree_host,
                                 LayerTreeHostImpl* layer_tree_host_impl);
-  virtual ~LatencyInfoSwapPromiseMonitor();
+  ~LatencyInfoSwapPromiseMonitor() override;
 
-  virtual void OnSetNeedsCommitOnMain() override;
-  virtual void OnSetNeedsRedrawOnImpl() override;
-  virtual void OnForwardScrollUpdateToMainThreadOnImpl() override;
+  void OnSetNeedsCommitOnMain() override;
+  void OnSetNeedsRedrawOnImpl() override;
+  void OnForwardScrollUpdateToMainThreadOnImpl() override;
 
  private:
   ui::LatencyInfo* latency_;