Standardize usage of virtual/override/final in components/

components/metrics/profiler/profiler_metrics_provider.h

Index: components/metrics/profiler/profiler_metrics_provider.h
diff --git a/components/metrics/profiler/profiler_metrics_provider.h b/components/metrics/profiler/profiler_metrics_provider.h
index d8bdff3b5ec7cf4cd0614d00548a2828f0b18616..f83bd41951aa906ca5692a436bff464c48438889 100644
--- a/components/metrics/profiler/profiler_metrics_provider.h
+++ b/components/metrics/profiler/profiler_metrics_provider.h
@@ -20,11 +20,10 @@ namespace metrics {
 class ProfilerMetricsProvider : public MetricsProvider {
  public:
   ProfilerMetricsProvider();
-  virtual ~ProfilerMetricsProvider();
+  ~ProfilerMetricsProvider() override;
 
   // MetricsDataProvider:
-  virtual void ProvideGeneralMetrics(
-      ChromeUserMetricsExtension* uma_proto) override;
+  void ProvideGeneralMetrics(ChromeUserMetricsExtension* uma_proto) override;
 
   // Records the passed profiled data, which should be a snapshot of the
   // browser's profiled performance during startup for a single process.