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

chrome/browser/metrics/chrome_stability_metrics_provider.h

Index: chrome/browser/metrics/chrome_stability_metrics_provider.h
diff --git a/chrome/browser/metrics/chrome_stability_metrics_provider.h b/chrome/browser/metrics/chrome_stability_metrics_provider.h
index bb722086c7e5458169ad21a664f8307d115f5d87..89913c19382e7d3ba13ba381a8e63b0a808fcafa 100644
--- a/chrome/browser/metrics/chrome_stability_metrics_provider.h
+++ b/chrome/browser/metrics/chrome_stability_metrics_provider.h
@@ -28,26 +28,26 @@ class ChromeStabilityMetricsProvider
       public content::NotificationObserver {
  public:
   ChromeStabilityMetricsProvider();
-  virtual ~ChromeStabilityMetricsProvider();
+  ~ChromeStabilityMetricsProvider() override;
 
   // metrics::MetricsDataProvider:
-  virtual void OnRecordingEnabled() override;
-  virtual void OnRecordingDisabled() override;
-  virtual void ProvideStabilityMetrics(
+  void OnRecordingEnabled() override;
+  void OnRecordingDisabled() override;
+  void ProvideStabilityMetrics(
       metrics::SystemProfileProto* system_profile_proto) override;
-  virtual void ClearSavedStabilityMetrics() override;
+  void ClearSavedStabilityMetrics() override;
 
   // Registers local state prefs used by this class.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
  private:
   // content::NotificationObserver:
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) override;
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
 
   // content::BrowserChildProcessObserver:
-  virtual void BrowserChildProcessCrashed(
+  void BrowserChildProcessCrashed(
       const content::ChildProcessData& data) override;
 
   // Logs the initiation of a page load and uses |web_contents| to do