Standardize usage of virtual/override/final in net/

net/http/http_auth_controller_unittest.cc

Index: net/http/http_auth_controller_unittest.cc
diff --git a/net/http/http_auth_controller_unittest.cc b/net/http/http_auth_controller_unittest.cc
index 306cabd46ba774a0bc20c6202bea966f587ebd61..c39256b641de603b7008810b26e8ca881687abae 100644
--- a/net/http/http_auth_controller_unittest.cc
+++ b/net/http/http_auth_controller_unittest.cc
@@ -128,7 +128,7 @@ TEST(HttpAuthControllerTest, NoExplicitCredentialsAllowed) {
     }
 
    protected:
-    virtual bool Init(HttpAuthChallengeTokenizer* challenge) override {
+    bool Init(HttpAuthChallengeTokenizer* challenge) override {
       HttpAuthHandlerMock::Init(challenge);
       set_allows_default_credentials(true);
       set_allows_explicit_credentials(false);
@@ -143,10 +143,10 @@ TEST(HttpAuthControllerTest, NoExplicitCredentialsAllowed) {
       return true;
     }
 
-    virtual int GenerateAuthTokenImpl(const AuthCredentials* credentials,
-                                      const HttpRequestInfo* request,
-                                      const CompletionCallback& callback,
-                                      std::string* auth_token) override {
+    int GenerateAuthTokenImpl(const AuthCredentials* credentials,
+                              const HttpRequestInfo* request,
+                              const CompletionCallback& callback,
+                              std::string* auth_token) override {
       int result =
           HttpAuthHandlerMock::GenerateAuthTokenImpl(credentials,
                                                      request, callback,