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

chromeos/system/fake_statistics_provider.h

Index: chromeos/system/fake_statistics_provider.h
diff --git a/chromeos/system/fake_statistics_provider.h b/chromeos/system/fake_statistics_provider.h
index c2dde047f5698c6eb8ae1f14b4eb070a6941b81f..7ea8ec2399630b120e33d671fd36d0e3453d45df 100644
--- a/chromeos/system/fake_statistics_provider.h
+++ b/chromeos/system/fake_statistics_provider.h
@@ -17,18 +17,18 @@ namespace system {
 class FakeStatisticsProvider : public StatisticsProvider {
  public:
   FakeStatisticsProvider();
-  virtual ~FakeStatisticsProvider();
+  ~FakeStatisticsProvider() override;
 
   // 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;
 
   void SetMachineStatistic(const std::string& key, const std::string& value);
   void ClearMachineStatistic(const std::string& key);
@@ -47,7 +47,7 @@ class FakeStatisticsProvider : public StatisticsProvider {
 class ScopedFakeStatisticsProvider : public FakeStatisticsProvider {
  public:
   ScopedFakeStatisticsProvider();
-  virtual ~ScopedFakeStatisticsProvider();
+  ~ScopedFakeStatisticsProvider() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ScopedFakeStatisticsProvider);