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

chrome/browser/sync/glue/invalidation_adapter.h

Index: chrome/browser/sync/glue/invalidation_adapter.h
diff --git a/chrome/browser/sync/glue/invalidation_adapter.h b/chrome/browser/sync/glue/invalidation_adapter.h
index 41adba062e737140185126021545b7ed4e6877a1..a57d14cc4462a3fcb311ca6efffc1b9117713cda 100644
--- a/chrome/browser/sync/glue/invalidation_adapter.h
+++ b/chrome/browser/sync/glue/invalidation_adapter.h
@@ -14,14 +14,14 @@ namespace browser_sync {
 class InvalidationAdapter : public syncer::InvalidationInterface {
  public:
   explicit InvalidationAdapter(const syncer::Invalidation& invalidation);
-  virtual ~InvalidationAdapter();
+  ~InvalidationAdapter() override;
 
   // Implementation of InvalidationInterface.
-  virtual bool IsUnknownVersion() const override;
-  virtual const std::string& GetPayload() const override;
-  virtual int64 GetVersion() const override;
-  virtual void Acknowledge() override;
-  virtual void Drop() override;
+  bool IsUnknownVersion() const override;
+  const std::string& GetPayload() const override;
+  int64 GetVersion() const override;
+  void Acknowledge() override;
+  void Drop() override;
 
  private:
   syncer::Invalidation invalidation_;