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

chrome/browser/sync/test/integration/sync_auth_test.cc

Index: chrome/browser/sync/test/integration/sync_auth_test.cc
diff --git a/chrome/browser/sync/test/integration/sync_auth_test.cc b/chrome/browser/sync/test/integration/sync_auth_test.cc
index db1bc2e680bccdb9e3a6299e926a7b40b95e24c1..0f958c2467fc5a0a6ea542bbd18f0555a031c899 100644
--- a/chrome/browser/sync/test/integration/sync_auth_test.cc
+++ b/chrome/browser/sync/test/integration/sync_auth_test.cc
@@ -50,9 +50,9 @@ const char kMalformedOAuth2Token[] = "{ \"foo\": ";
 class TestForAuthError : public SingleClientStatusChangeChecker {
  public:
   explicit TestForAuthError(ProfileSyncService* service);
-  virtual ~TestForAuthError();
-  virtual bool IsExitConditionSatisfied() override;
-  virtual std::string GetDebugMessage() const override;
+  ~TestForAuthError() override;
+  bool IsExitConditionSatisfied() override;
+  std::string GetDebugMessage() const override;
 };
 
 TestForAuthError::TestForAuthError(ProfileSyncService* service)