Standardize usage of virtual/override/final in google_apis/

google_apis/gaia/oauth2_api_call_flow.h

Index: google_apis/gaia/oauth2_api_call_flow.h
diff --git a/google_apis/gaia/oauth2_api_call_flow.h b/google_apis/gaia/oauth2_api_call_flow.h
index 26feefbaa8ee0f55e85b1b3e590bd6212ad6ec37..164e2d15eff4a76f6f86674a165fbb6b26921e6d 100644
--- a/google_apis/gaia/oauth2_api_call_flow.h
+++ b/google_apis/gaia/oauth2_api_call_flow.h
@@ -32,14 +32,14 @@ class OAuth2ApiCallFlow
  public:
   OAuth2ApiCallFlow();
 
-  virtual ~OAuth2ApiCallFlow();
+  ~OAuth2ApiCallFlow() override;
 
   // Start the flow.
   virtual void Start(net::URLRequestContextGetter* context,
                      const std::string& access_token);
 
   // net::URLFetcherDelegate implementation.
-  virtual void OnURLFetchComplete(const net::URLFetcher* source) override;
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
 
  protected:
   // Template methods for sub-classes.