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

chromeos/system/statistics_provider.cc

Index: chromeos/system/statistics_provider.cc
diff --git a/chromeos/system/statistics_provider.cc b/chromeos/system/statistics_provider.cc
index 7ac8863a4b2208e2b949709c7aba243feb841f03..8451bdf4ce2db7542f9c317ebd65c0086f00b7b9 100644
--- a/chromeos/system/statistics_provider.cc
+++ b/chromeos/system/statistics_provider.cc
@@ -94,15 +94,15 @@ bool HasOemPrefix(const std::string& name) {
 class StatisticsProviderImpl : public StatisticsProvider {
  public:
   // StatisticsProvider implementation:
-  virtual void StartLoadingMachineStatistics(
+  void StartLoadingMachineStatistics(
       const scoped_refptr<base::TaskRunner>& file_task_runner,
       bool load_oem_manifest) override;
-  virtual bool GetMachineStatistic(const std::string& name,
-                                   std::string* result) override;
-  virtual bool HasMachineStatistic(const std::string& name) override;
-  virtual bool GetMachineFlag(const std::string& name, bool* result) override;
-  virtual bool HasMachineFlag(const std::string& name) override;
-  virtual void Shutdown() override;
+  bool GetMachineStatistic(const std::string& name,
+                           std::string* result) override;
+  bool HasMachineStatistic(const std::string& name) override;
+  bool GetMachineFlag(const std::string& name, bool* result) override;
+  bool HasMachineFlag(const std::string& name) override;
+  void Shutdown() override;
 
   static StatisticsProviderImpl* GetInstance();
 
@@ -111,7 +111,7 @@ class StatisticsProviderImpl : public StatisticsProvider {
   friend struct DefaultSingletonTraits<StatisticsProviderImpl>;
 
   StatisticsProviderImpl();
-  virtual ~StatisticsProviderImpl();
+  ~StatisticsProviderImpl() override;
 
   // Waits up to |kTimeoutSecs| for statistics to be loaded. Returns true if
   // they were loaded successfully.