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

chromeos/geolocation/simple_geolocation_request.h

Index: chromeos/geolocation/simple_geolocation_request.h
diff --git a/chromeos/geolocation/simple_geolocation_request.h b/chromeos/geolocation/simple_geolocation_request.h
index 88de64b9179b60759133062c201c6b87cc53fe66..179efcb21a1093a387eea1023a6634ccce9cfc76 100644
--- a/chromeos/geolocation/simple_geolocation_request.h
+++ b/chromeos/geolocation/simple_geolocation_request.h
@@ -48,7 +48,7 @@ class SimpleGeolocationRequest : private net::URLFetcherDelegate {
                            const GURL& service_url,
                            base::TimeDelta timeout);
 
-  virtual ~SimpleGeolocationRequest();
+  ~SimpleGeolocationRequest() override;
 
   // Initiates request.
   // Note: if request object is destroyed before callback is called,
@@ -67,7 +67,7 @@ class SimpleGeolocationRequest : private net::URLFetcherDelegate {
 
  private:
   // net::URLFetcherDelegate
-  virtual void OnURLFetchComplete(const net::URLFetcher* source) override;
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
 
   // Start new request.
   void StartRequest();