Update {virtual,override} to follow C++11 style in components.

components/browser_watcher/watcher_metrics_provider_win.h

 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_BROWSER_WATCHER_WATCHER_METRICS_PROVIDER_WIN_H_
 #define COMPONENTS_BROWSER_WATCHER_WATCHER_METRICS_PROVIDER_WIN_H_
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "components/metrics/metrics_provider.h"
@@ skipping 13 matching lines @@
 // - Stability.ExitFunnel.KillProcess: 30
 class WatcherMetricsProviderWin : public metrics::MetricsProvider {
  public:
   static const char kBrowserExitCodeHistogramName[];
   static const char kExitFunnelHistogramPrefix[];
 
   // Initializes the reporter. If |report_exit_funnels| is false, the provider
   // will clear the registry data, but not report it.
   WatcherMetricsProviderWin(const base::char16* registry_path,
                             bool report_exit_funnels);
-  ~WatcherMetricsProviderWin();
+  ~WatcherMetricsProviderWin() override;
 
   // metrics::MetricsProvider implementation.
-  virtual void ProvideStabilityMetrics(
+  void ProvideStabilityMetrics(
       metrics::SystemProfileProto* system_profile_proto) override;
 
  private:
   base::string16 registry_path_;
   bool report_exit_funnels_;
 
   DISALLOW_COPY_AND_ASSIGN(WatcherMetricsProviderWin);
 };
 
 }  // namespace browser_watcher
 
 #endif  // COMPONENTS_BROWSER_WATCHER_WATCHER_METRICS_PROVIDER_WIN_H_