Standardize usage of virtual/override/final in google_apis/

google_apis/drive/base_requests_unittest.cc

Index: google_apis/drive/base_requests_unittest.cc
diff --git a/google_apis/drive/base_requests_unittest.cc b/google_apis/drive/base_requests_unittest.cc
index 3865eee763027782109042cf40bee0ee31263bf5..e4e918b795bad5993c04c9625143effaf2dab83f 100644
--- a/google_apis/drive/base_requests_unittest.cc
+++ b/google_apis/drive/base_requests_unittest.cc
@@ -35,15 +35,14 @@ class FakeUrlFetchRequest : public UrlFetchRequestBase {
         url_(url) {
   }
 
-  virtual ~FakeUrlFetchRequest() {
-  }
+  ~FakeUrlFetchRequest() override {}
 
  protected:
-  virtual GURL GetURL() const override { return url_; }
-  virtual void ProcessURLFetchResults(const net::URLFetcher* source) override {
+  GURL GetURL() const override { return url_; }
+  void ProcessURLFetchResults(const net::URLFetcher* source) override {
     callback_.Run(GetErrorCode());
   }
-  virtual void RunCallbackOnPrematureFailure(GDataErrorCode code) override {
+  void RunCallbackOnPrematureFailure(GDataErrorCode code) override {
     callback_.Run(code);
   }